Esters questions

Which of the following has a molecule that contains a C – O bond and a C = O bond?

1. A Ketones.
2. B Esters.
3. C Alcohols.
4. D Ethers.

Which of the following compounds is an ester?

1. A (CH₃)₃COC(CH₃)₃
2. B CH₃COOCH₂CH₃
3. C (CH₃)₃CCOOH
4. D CH₃OCH₃

The ester whose chemical formula is CH₃COOC₆H₅ is called ..........

1. A phenyl ethanoate only.
2. B methyl benzoate only.
3. C phenyl acetate or methyl benzoate.
4. D phenyl ethanoate or phenyl acetate.

What is the chemical formula of methyl propanoate?

1. A CH₃CH₂COOCH₃
2. B CH₃COOCH₂CH₃
3. C CH₃COOCH₂CH₂CH₃
4. D HCOOCH₂CH₂CH₃

What is the IUPAC name of the opposite compound?

1. A Methyl 2,4-dimethylpentanoate.
2. B Butyl 2,4-dimethylethanoate.
3. C Methyl 3,5-dimethylpentanoate.
4. D Methyl 1,1,3-trimethylpentanoate.

Which of the following represents the structural formula of ethyl benzoate?

1. A A
2. B B
3. C C
4. D D

All of the following are isomers of ethyl ethanoate, except ..........

1. A butanoic acid.
2. B methyl propanoate.
3. C 2-methylbutanoic acid.
4. D propyl methanoate.

What is the molecular isomer of methyl benzoate?

1. A Butanoic acid.
2. B Phenylacetic acid.
3. C Ethyl acetate.
4. D Propyl benzoate.

All of the following are isomers of pentyl acetate, except ..........

1. A hexyl formate.
2. B heptanoic acid.
3. C butyl propanoate.
4. D propyl propanoate.

An ester has a molar mass of 74 g/mol.
Which of the following expresses the number of its isomers that do not form hydrogen bonds?
[H = 1 , C = 12 , O = 16]

1. A 2
2. B 3
3. C 4
4. D 5

The opposite ester is produced by the reaction of ..........

1. A ethene and 1-butanol.
2. B ethane and pentanoic acid.
3. C ethanol and pentanoic acid.
4. D ethanol and butanoic acid.

The ester shown in the opposite figure is produced by the reaction of ..........

1. A 1-butanol with methylpropanoic acid.
2. B 1-propanol with butanoic acid.
3. C 2-propanol with butanoic acid.
4. D 2-propanol with propanoic acid.

The opposite figure shows the structural formula of an ester produced by the reaction of ..........

1. A ethanol with butanoic acid.
2. B propanol with propanoic acid.
3. C butanol with ethanoic acid.
4. D propanol with ethanoic acid.

When butanoic acid reacts with pentanol, an ester is produced whose chemical formula is ..........

1. A CH₃CH₂CH₂COOCH₂CH₂CH₂CH₃
2. B CH₃CH₂CH₂COOCH₂CH₂CH₂CH₂CH₃
3. C CH₃CH₂CH₂CH₂COOCH₂CH₂CH₂CH₂CH₃
4. D CH₃CH₂CH₂CH₂CH₂COOCH₂CH₂CH₂CH₃

What is the compound produced by the esterification of the opposite organic acid with excess ethanol?

1. A A
2. B B
3. C C
4. D D

The formula of an ester is CH₃CH₂COOCH₂CH₂CH₂CH₃. Which of the following is correct?

1. A Acid part: butanoate , alcohol alkyl: butyl
2. B Acid part: butanoate , alcohol alkyl: propyl
3. C Acid part: propanoate , alcohol alkyl: butyl
4. D Acid part: propanoate , alcohol alkyl: propyl

Which of the following reactants are used to prepare ethyl butanoate?

1. A C₂H₅OH , C₃H₇COOH
2. B C₂H₅OH , C₄H₉COOH
3. C C₃H₇OH , C₃H₇COOH
4. D C₃H₇OH , C₄H₉COOH

Which of the following expresses the relation between the number of carbon, hydrogen and oxygen atoms in any ester compared with the sum of their numbers in the alcohol and the acid used to produce this ester?

1. A C : less , H : less , O : less
2. B C : less , H : equal , O : less
3. C C : equal , H : less , O : less
4. D C : equal , H : less , O : equal

Propyl methanoate is prepared by the reaction of CH₃CH₂CH₂OH with ..........

1. A HCOOH by addition.
2. B CH₃COOH by addition.
3. C HCOOH by condensation.
4. D CH₃COOH by condensation.

Which of the following compounds is an isomer of the compound produced by the reaction of ethanol with ethanoic acid and has the same functional group?

1. A Propanoic acid.
2. B Ethyl ethanoate.
3. C Butanoic acid.
4. D Methyl propanoate.

The opposite chemical formulas are for an alcohol (X) and an organic acid (Y):
(X) : CH₃CH(OH)CH₂CH₃ , (Y) : CH₃COOH
What is the name of the alcohol (X) and of the ester (Z) produced by the reaction of the alcohol with the acid (Y)?

1. A (X) : isobutyl alcohol , (Z) : isopropyl acetate ester.
2. B (X) : isobutyl alcohol , (Z) : secondary butyl acetate ester.
3. C (X) : secondary butyl alcohol , (Z) : secondary butyl acetate ester.
4. D (X) : secondary butyl alcohol , (Z) : isopropyl acetate ester.

The opposite Venn diagram shows the materials in whose manufacture ethanol and ethanoic acid are used, and the organic compound (2) produced by combining them.
Which of the following is correct?

1. A (1) : denatured alcohol , (2) : flavourings , (3) : perfumes.
2. B (1) : disinfectants , (2) : perfumes , (3) : insecticides.
3. C (1) : artificial silk , (2) : odour enhancers , (3) : disinfectants.
4. D (1) : preservatives , (2) : solvents , (3) : artificial silk.

Which of the following compounds reacts with the product of its complete oxidation, forming a liquid with a pleasant smell?

1. A Propanal.
2. B Propanoic acid.
3. C Propanone.
4. D 1-propanol.

An alkyl halide can be converted into an ester by the steps ..........

1. A substitution, then oxidation, then reaction with an alcohol.
2. B addition, then reduction, then substitution.
3. C oxidation, then substitution, then reaction with an organic acid.
4. D substitution, then reduction, then oxidation.

What is the product of the reaction of 1 mol of lactic acid with 1 mol of ethanoic acid?

1. A A carboxylic ester.
2. B A hydroxy ester.
3. C A carboxylic ketone.
4. D A hydroxy ketone.

What is the product of the reaction of 1 mol of lactic acid with 1 mol of ethanol?

1. A A carboxylic ester.
2. B A hydroxy ester.
3. C A carboxylic ketone.
4. D A hydroxy ketone.

The following table shows the molar masses of three organic compounds:
2-butanol : 74 g/mol , methyl acetate : 74 g/mol , 2-methylbutane : 72 g/mol
Which of the following expresses the boiling points of these compounds?

1. A 2-butanol : 99°C , methyl acetate : 99°C , 2-methylbutane : 95°C
2. B 2-butanol : 99°C , methyl acetate : 57°C , 2-methylbutane : 28°C
3. C 2-butanol : 50°C , methyl acetate : 50°C , 2-methylbutane : 47°C
4. D 2-butanol : 99°C , methyl acetate : 57°C , 2-methylbutane : −7°C

The following three compounds have the same molar mass.
Which of the following expresses the boiling points of the three compounds?

1. A C₃H₇COOH : 77.1°C , CH₃COOC₂H₅ : 163.7°C , C₅H₁₁OH : 137.9°C
2. B C₃H₇COOH : 163.7°C , CH₃COOC₂H₅ : 77.1°C , C₅H₁₁OH : 137.9°C
3. C C₃H₇COOH : 137.9°C , CH₃COOC₂H₅ : 163.7°C , C₅H₁₁OH : 77.1°C
4. D C₃H₇COOH : 77.1°C , CH₃COOC₂H₅ : 137.9°C , C₅H₁₁OH : 163.7°C

Two compounds (A) and (B) are hydrocarbon derivatives with the same molar mass. The boiling point of compound (A) is 57°C, while the boiling point of compound (B) is 117.7°C. What are compounds (A) and (B)?

1. A (A) : ethyl butanoate , (B) : ethyl acetate
2. B (A) : 1-hexanol , (B) : methyl butanoate
3. C (A) : methyl acetate , (B) : 1-butanol
4. D (A) : 1-butanol , (B) : methyl acetate

The following table shows three compounds with equal molar masses:
CH₃(CH₂)₂OH : 97°C
CH₃COOH : 118°C
HCOOCH₃ : (X)
What is the boiling point (X)?

1. A 31°C
2. B 101°C
3. C 114°C
4. D 156°C

Which of the following esters gives propanoic acid and propanol when it is hydrolysed?

1. A A
2. B B
3. C C
4. D D

Butanoic acid can be obtained from ..........

1. A the acid hydrolysis of butyl ethanoate.
2. B the alkaline hydrolysis of butyl ethanoate.
3. C the acid hydrolysis of ethyl butanoate.
4. D the alkaline hydrolysis of ethyl butanoate.

The acid hydrolysis of compound (X) forms two compounds that give the same colour with drops of bromothymol blue.
What is compound (X)?

1. A CH₃COOCH₂CH₂OH
2. B CH₃COOCH₂CH₂COOH
3. C CH₃CH₂COOCH₂CH₂CH₃
4. D CH₃CH₂CH(OH)CH(OH)CH₂CH₃

Compound (X) contains one ester group, and the mass percentage of oxygen in it is 27.6%
What are the two compounds produced by the acid hydrolysis of compound (X)?
[C = 12 , H = 1 , O = 16]

1. A 1-butanol and ethanoic acid.
2. B Ethanol and propanoic acid.
3. C Methanol and methanoic acid.
4. D 2-propanol and butanoic acid.

What are the products of the acid hydrolysis of the compound (CH₃)₂CHOCO(CH₂)₂CH₃?

1. A 1-propanol and butanoic acid.
2. B 2-propanol and butanoic acid.
3. C 1-propanol and propanoic acid.
4. D 2-propanol and propanoic acid.

An ester (X), when hydrolysed in an acidic medium, gives two compounds that each react with sodium hydroxide.
What is ester (X)?

1. A Ethyl acetate.
2. B Methyl formate.
3. C Ethyl benzoate.
4. D Phenyl ethanoate.

From the opposite compound: how many moles of C₃H₈O₃ are produced by the acid hydrolysis of one mole of this compound, and how many moles of oxygen are needed for the complete combustion of 1 mol of the other product of the hydrolysis, respectively?

1. A 1 mol , 26 mol
2. B 3 mol , 17 mol
3. C 1 mol , 17 mol
4. D 3 mol , 26 mol

What is the product of the alkaline hydrolysis of the opposite ester?
(The ester: CH₃CH₂COOCH₂CH₃)

1. A Propanoic acid + sodium ethoxide.
2. B Sodium propanoate + sodium ethoxide.
3. C Propanoic acid + ethanol.
4. D Sodium propanoate + ethanol.

Which compound gives both methanol and sodium ethanoate when treated with sodium hydroxide solution?

1. A CH₃COOCH₃
2. B HCOOC₂H₅
3. C CH₃COOC₂H₅
4. D HOCH₂CH₂COOH

What is the product of the hydrolysis of the compound C₁₅H₃₁COOC₁₆H₃₃ with excess sodium hydroxide solution?

1. A C₁₆H₃₃COONa , C₁₅H₃₁ONa
2. B C₁₆H₃₃COONa , C₁₅H₃₁OH
3. C C₁₆H₃₃COONa , C₁₅H₃₁COONa
4. D C₁₆H₃₃OH , C₁₅H₃₁COONa

The basic hydrolysis of a compound with the general formula RCO¹⁸OR forms ..........

1. A an alkoxide and an organic acid containing ¹⁸O
2. B an organic acid and an alkoxide containing ¹⁸O
3. C an alcohol and a salt of an organic acid containing ¹⁸O
4. D a salt of an organic acid and an alcohol containing ¹⁸O

The alcohol produced by the alkaline hydrolysis of ethyl propanoate reacts with 2-methylpropanoic acid, forming the ester ..........

1. A (CH₃)₂CHCOOCH₂CH₃
2. B (CH₃)₂CHCOOCH₂CH₂CH₃
3. C CH₃COOCH₂CH(CH₃)CH₃
4. D CH₃CH₂COOCH₂CH(CH₃)CH₃

The hydrolysis of ethyl butanoate using excess sodium hydroxide solution forms ..........

1. A CH₃CH₂CH₂COONa
2. B CH₃COOH
3. C CH₃CH₂ONa
4. D CH₃CH₂CH₂COONa + CH₃CH₂ONa

The opposite Venn diagram shows the products of the hydrolysis of ethyl ethanoate.
(1) : hydrolysis in a basic medium only , (3) : hydrolysis in an acidic medium only , (2) : common to both.
Which of the following is correct?

1. A (1) : acid , (2) : salt , (3) : alcohol.
2. B (1) : salt , (2) : acid , (3) : alcohol.
3. C (1) : alcohol , (2) : acid , (3) : salt.
4. D (1) : salt , (2) : alcohol , (3) : acid.

The hydrolysis of the opposite compound by heating with excess sodium hydroxide solution produces ..........
The compound: HCOO–CH₂–CH₂–CH₂–OOC–CH₃

1. A HCOOH + HOCH₂CH₂CH₂OH + CH₃COOH
2. B HCOOH + NaOCH₂CH₂CH₂ONa + CH₃COOH
3. C HCOONa + HOCH₂CH₂CH₂OH + CH₃COONa
4. D HCOONa + NaOCH₂CH₂CH₂ONa + CH₃COONa

Which of the following expresses the properties of the following compound?
HO–CH₂–CH=CH–O–CO–CH₂–OH

1. A With aqueous NaOH: forms a salt of an organic acid , with bromine water: the colour disappears , with aqueous Na₂CO₃: effervescence occurs
2. B With aqueous NaOH: forms an organic acid , with bromine water: no noticeable change , with aqueous Na₂CO₃: effervescence occurs
3. C With aqueous NaOH: forms a salt of an organic acid , with bromine water: the colour disappears , with aqueous Na₂CO₃: no effervescence
4. D With aqueous NaOH: forms an organic acid , with bromine water: no noticeable change , with aqueous Na₂CO₃: no effervescence

From the chemical formula of the opposite compound: CH₃(CH₂)₁₄COONa
What is this compound used for, and from which acid is this salt derived?

1. A Synthetic detergent / palmitic acid.
2. B Soap making / butyric acid.
3. C Synthetic detergent / pentadecanoic acid.
4. D Soap making / palmitic acid.

After the acid hydrolysis of an organic compound, excess sodium hydroxide solution was added.
Which of the following is likely to form?

1. A A
2. B B
3. C C
4. D D

The opposite structural formula represents ..........

1. A amines.
2. B aldehydes.
3. C alcohols.
4. D amides.

What is the general formula of the amides of aliphatic acids?

1. A RNH₂
2. B RCOONH₂
3. C RONH₂
4. D RCONH₂

Which of the following compounds is an amide?

1. A A
2. B B
3. C C
4. D D

All of the following are correct for the opposite compound, except ..........
The compound: CH₂=CH–CONH₂

1. A It takes part in addition polymerization.
2. B It contains an amide group.
3. C It is an amino acid.
4. D It is an alkene derivative.

The ammonolysis of isopropyl formate produces ..........

1. A a primary alcohol and an acid amide whose molecule contains 5 atoms.
2. B a secondary alcohol and an acid salt whose molecule contains 5 atoms.
3. C a primary alcohol and an acid salt whose molecule contains 6 atoms.
4. D a secondary alcohol and an acid amide whose molecule contains 6 atoms.

Three organic compounds (A), (B) and (C):
• Compound (A): a hydrocarbon prepared from propanol by an elimination reaction.
• Compound (B): an aromatic hydrocarbon derivative that is sparingly soluble in water (at 25°C).
• Compound (C): undergoes ammonolysis.
Which of the following is correct?

1. A (A) : removes the colour of bromine water , (B) : its solubility in water increases on heating , (C) : an ether
2. B (A) : does not remove the colour of bromine water , (B) : mixes completely with water (at 65°C) , (C) : not affected by (MnO₄⁻ / H⁺)
3. C (A) : can undergo addition polymerization , (B) : contains a hydroxyl group , (C) : an ester
4. D (A) : can undergo condensation polymerization , (B) : does not contain a hydroxyl group , (C) : an ester

From the following chart:
• Compound (1): forms in the body because of hard physical effort.
• Compound (2): freezes at 16°C when it is pure.
• Compound (3): the simplest aliphatic alcohol.
Which of the following expresses compounds (1), (4) and (5)?

1. A (1) : reacts with sodium bicarbonate , (4) : has a characteristic smell , (5) : undergoes ammonolysis.
2. B (1) : does not react with NaOH(aq) , (4) : has a characteristic smell , (5) : undergoes hydrolysis.
3. C (1) : does not react with NaOH(aq) , (4) : a gas (at 25°C) , (5) : undergoes ammonolysis.
4. D (1) : reacts with sodium bicarbonate , (4) : a gas (at 25°C) , (5) : undergoes hydrolysis.

What is the correct order of the chemical processes used to convert aromatic benzene into an aromatic compound with the molecular formula C₇H₇ON?

1. A Alkylation – oxidation – esterification – ammonolysis.
2. B Oxidation – ammonolysis – alkylation – esterification.
3. C Ammonolysis – alkylation – esterification – oxidation.
4. D Esterification – ammonolysis – oxidation – alkylation.

The following two statements may describe 1-propanol:
• Statement (1): on complete oxidation by Cr₂O₇²⁻ in an acidic medium, it forms an organic compound with a higher boiling point than 1-propanol.
• Statement (2): when ethanoic acid is added to it with a few drops of concentrated H₂SO₄, a compound with the taste of pears forms.
Which of the following describes 1-propanol?

1. A Statement (1) ✗ , statement (2) ✗
2. B Statement (1) ✗ , statement (2) ✓
3. C Statement (1) ✓ , statement (2) ✗
4. D Statement (1) ✓ , statement (2) ✓

What process is used to convert oil into soap?

1. A Ammonolysis.
2. B Condensation.
3. C Hydration.
4. D Alkaline hydrolysis.

All of the following describe glycerides, except ..........

1. A Fatty acids are used in preparing them.
2. B A trihydroxy alcohol is used in preparing them.
3. C They are salts of fatty acids.
4. D They are hydrolysed by an alkali, forming soap.

The sodium salt of a long-chain fatty acid is known as ..........

1. A fat.
2. B oil.
3. C soap.
4. D synthetic detergent.

Four different samples of oils (W), (X), (Y) and (Z), equal in number of moles, each had 200 mL of hydrogen gas passed through it under suitable conditions for the reaction. The table shows the volume of H₂ gas left unreacted:
(W) : zero , (X) : 200 mL , (Y) : 168 mL , (Z) : 120 mL
Which of the following represents the unsaturated oil(s)?

1. A (X) only.
2. B (W) only.
3. C (Y) , (Z) only.
4. D (W) , (Y) , (Z) only.

The opposite Venn diagram shows some properties of fats and oils.
Which of the following is correct?

1. A (1) : their acids are unsaturated , (2) : long-chain , (3) : their acids are saturated.
2. B (1) : their acids are saturated , (2) : hydrolysed in H⁺ , (3) : their acids are unsaturated.
3. C (1) : their acids are unsaturated , (2) : not hydrolysed in H⁺ , (3) : their acids are saturated.
4. D (1) : their acids are saturated , (2) : soluble in water , (3) : their acids are unsaturated.

Which of the following is not one of the compounds that react to form oils?

1. A Pyrogallol.
2. B A long-chain fatty acid.
3. C Glycerol.
4. D A short-chain fatty acid.

The following segment is from a polymer produced by condensation polymerization:
What are the two monomers that form this polymer?

1. A A
2. B B
3. C C
4. D D

A student assumed that the following three conditions are necessary for preparing polyesters:
(1) : the monomers contain –OH and –COOH groups.
(2) : small molecules are removed.
(3) : the two monomers used are identical.
Which of the following expresses the correct assumptions?

1. A Assumption (1) ✓ , assumption (2) ✗ , assumption (3) ✗
2. B Assumption (1) ✗ , assumption (2) ✓ , assumption (3) ✗
3. C Assumption (1) ✓ , assumption (2) ✓ , assumption (3) ✗
4. D Assumption (1) ✓ , assumption (2) ✓ , assumption (3) ✓

The following chart shows the reactions that take place under suitable conditions to form compounds (A) and (B):
Which of the following expresses compounds (A) and (B)?

1. A (A) : an alcohol , (B) : an ether.
2. B (A) : an organic acid , (B) : a copolymer.
3. C (A) : an alcohol , (B) : a copolymer.
4. D (A) : an organic acid , (B) : an ether.

Three polymers have the following properties:
• Polymer (A): an electrical insulator, dark brown in colour.
• Polymer (B): an electrical insulator and non-stick.
• Polymer (C): chemically inert and used for medical purposes.
What polymerization method is used to make these polymers?

1. A (A) : condensation , (B) : condensation , (C) : addition
2. B (A) : addition , (B) : addition , (C) : condensation
3. C (A) : condensation , (B) : addition , (C) : condensation
4. D (A) : addition , (B) : condensation , (C) : addition

The following two monomers: HOOC–(CH₂)₂–COOH , HO–CH₂–CH₂–OH
can form the polymer ..........

1. A A
2. B B
3. C C
4. D D

The following represents the repeating unit of a polymer formed by condensation:
–OOCCH₂COOCH₂CH₂CH₂–
What monomers are used to form this polymer?

1. A HOCH₂CH₂COOH only.
2. B HOOCCH₂CH₂COOH + HOCH₂CH₂OH
3. C HOOCCOOH + HOCH₂CH₂CH₂CH₂OH
4. D HOOCCH₂COOH + HOCH₂CH₂CH₂OH

The opposite Venn diagram shows the materials used to prepare oil of wintergreen and aspirin.
Which of the following is correct?

1. A (1) : methanol , (2) : salicylic acid , (3) : ethanoic acid.
2. B (1) : salicylic acid , (2) : methanol , (3) : ethanoic acid.
3. C (1) : methanol , (2) : ethanoic acid , (3) : salicylic acid.
4. D (1) : ethanoic acid , (2) : salicylic acid , (3) : methanol.

The chemical formula of aspirin is ..........

1. A A
2. B B
3. C C
4. D D

Aspirin forms by a(n) .......... reaction.

1. A condensation
2. B alkylation
3. C addition
4. D hydrogenation

The molecule of each of the following compounds contains a methyl group, except ..........

1. A Dacron.
2. B oil of wintergreen.
3. C toluene.
4. D aspirin.

The following compounds contain a (–COOH) group, except ..........

1. A aspirin.
2. B benzoic acid.
3. C picric acid.
4. D salicylic acid.

Which of the following compounds reacts with the salt NaHCO₃?

1. A Carbolic acid.
2. B Ethylene.
3. C Aspirin.
4. D Picric acid.

What do oil of wintergreen and aspirin have in common?

1. A Medical importance.
2. B Each contains a –COO– group.
3. C The way they are used.
4. D Each contains a –COOH group.

All of the following are correct, except ..........

1. A Salicylic acid is monobasic.
2. B Ethyl salicylate is an ester.
3. C Salicylic acid gives a violet colour with FeCl₃ solution and reacts with NaHCO₃
4. D Methyl salicylate is not found in natural plant oils.

The pure acid (X) looks like ice when it freezes, and its dilute solutions are used as food additives.
Which of the following shows the uses of acid (X)?

1. A Making aspirin ✓ , making artificial silk ✗ , sulphonation of benzene ✓
2. B Making aspirin ✗ , making artificial silk ✓ , sulphonation of benzene ✗
3. C Making aspirin ✓ , making artificial silk ✓ , sulphonation of benzene ✗
4. D Making aspirin ✗ , making artificial silk ✗ , sulphonation of benzene ✓

From the following table:
Which of the following is correct?

1. A Compounds (A) and (B) are used to prepare methyl salicylate, and compounds (D) and (E) are produced by the hydrolysis of a saturated triglyceride.
2. B Compounds (A) and (C) are used to prepare methyl salicylate, and compounds (E) and (F) are produced by the hydrolysis of a saturated triglyceride.
3. C Compound (A) is used to prepare methyl salicylate, and compounds (D) and (E) are produced by the hydrolysis of a saturated triglyceride.
4. D Compound (A) is used to prepare methyl salicylate, and compounds (B) and (C) are produced by the hydrolysis of a saturated triglyceride.

All of the following describe the aliphatic compound produced by the hydrolysis of oil of wintergreen, except ..........

1. A It is one of the components of red spirit.
2. B It is affected by KMnO₄ solution acidified with H₂SO₄
3. C It has no isomers.
4. D It reacts with NaOH solution.

Three oxygen-containing organic compounds:
• Compound (1): the mass of oxygen in it is x g and its molar mass is 32 g/mol
• Compound (2): the mass of oxygen in it is 3x g and its molar mass is 138 g/mol
• Compound (3): the mass of oxygen in it is 2x g and its molar mass is 60 g/mol
What is the molar mass of the ester produced by the reaction of 1 mol of compound (1) with 1 mol of compound (3)? And what is the importance of the ester produced by the reaction of compound (2) with compound (3)?
[C = 12 , H = 1 , O = 16]

1. A 92 g/mol / making candles.
2. B 92 g/mol / lowers fever.
3. C 74 g/mol / reduces blood clotting.
4. D 74 g/mol / relieves rheumatic pain.

All of the following describe the product of the hydrolysis of one mole of aspirin, except ..........

1. A It reacts with 3 mol of sodium hydroxide.
2. B It reacts with 106 g of sodium carbonate [Na₂CO₃ = 106 g/mol].
3. C It turns bromothymol blue light green.
4. D In it [H⁺] is greater than [OH⁻].

How many moles of hydrogen are needed for the complete reduction of the hydrolysis products of 1 mol of aspirin?

1. A 2 mol
2. B 3 mol
3. C 4 mol
4. D 6 mol

The complete reduction, by suitable reducing agents (under suitable conditions), of the hydrolysis products of aspirin gives compounds containing a(n) .......... group.

1. A secondary alcohol
2. B primary alcohol
3. C carbonyl
4. D formyl

What is the correct order of the processes used to convert chlorobenzene into the active substance in aspirin?

1. A Oxidation – alkylation – alkaline hydrolysis.
2. B Oxidation – alkaline hydrolysis – alkylation.
3. C Alkaline hydrolysis – alkylation – oxidation.
4. D Alkaline hydrolysis – oxidation – alkylation.

Write the common name and the IUPAC name of each of:
(1) H–COOCH₂CH₃
(2) C₂H₅–CO–O–C₃H₇

One of the organic compounds is represented by the formula CH₃CH₂COOCH₃:
(1) Write the IUPAC name of this compound.
(2) Draw the structural formulas of the two compounds used to prepare this compound, and state which of them has the higher boiling point.

Polymer (X) is made of the two monomers: HOOC–C₆H₄–COOH (terephthalic acid) , HOCH₂CH₂OH
Deduce the formula of the copolymer (X) produced by the condensation of these two monomers, and state a medical use of this polymer.

The opposite figure shows the structural formula of a compound:
(1) What is the functional group in the molecule of this compound that explains its pleasant smell?
(2) Deduce the structural formulas of the two compounds used to prepare this compound, and give the IUPAC name of the aliphatic compound.

Butanoic acid is an aliphatic organic acid:
(1) State the property on which a practical experiment to prove that this acid is weak is based.
(2) Draw the structural formula of the organic compound produced by the reaction of 1 mol of butanoic acid with 1 mol of ethylene glycol.

Acid (X) is extracted from butter:
(1) Draw the structural formula of the aldehyde used to prepare this acid.
(2) Write the symbolic equation for the reaction of acid (X) with ethanol.

The first member of the alcohols reacts with the first member of the aliphatic acids, forming ester (X):
(1) Draw the structural formula of ester (X), and write its IUPAC name.
(2) Use "higher than" or "lower than" to compare the boiling point of ester (X) with each of the alcohol and the acid it is derived from.

Ethyl propanoate is produced by the reaction of alcohol (X) with organic acid (Y):
(1) Write the names of the alcohol and the acid used.
(2) Draw the structural formula of the product.

Ethyl acetate is hydrolysed in an acidic medium, forming alcohol (A) and acid (B).
Draw the structural formula of each of:
(1) the aldehyde corresponding to alcohol (A).
(2) the alcohol corresponding to acid (B).

Write the ammonolysis equation of each of the following esters, and write the name of the amide produced from ester (1):
Ester (1): CH₃–CO–O–C₂H₅
Ester (2): H–COOCH₂CH₃

The opposite structural formula represents an ester produced by the reaction of alcohol (A) with acid (B): C₂H₅–CO–O–C₃H₇
(1) Write the symbolic equation for preparing alcohol (A) from a suitable alkyl halide.
(2) Draw the structural formula of the amide of acid (B).

From the opposite chart:
(1) What are the names of compounds (2) and (3), if only compound (3) is neutral to litmus?
(2) Compare compounds (2) and (3) "in terms of: reaction with soda lime".

From the opposite chart:
(1) State the type of reactions (1) and (2).
(2) Write the equation for preparing an alkane from salt (3).

Write the symbolic equations for preparing a compound used to relieve rheumatic pain from methyl chloride.

Write the symbolic equations for preparing acetamide from ethanol.

Write the symbolic equation for preparing each of:
(1) HCOOCH₃
(2) C₆H₅COOCH₃

Explain the following:
(1) Dry HCl gas is used in the esterification of benzoic acid with methanol, and concentrated sulphuric acid is not used.
(2) The acidity of a mixture of 1 mol of propanoic acid and 1 mol of ethanol.

A monobasic carboxylic acid (containing a number of carboxyl groups equal to its number of carbon atoms) is added to an alcohol whose freezing point is −110.5°C (Sample exam 2026)
Which of the following expresses the number of isomers of the product that have the same functional group?

1. A 0
2. B 1
3. C 2
4. D 3

Study the opposite compound: (Sample exam 2026)
Which of the following expresses the correct results when the following experiments are carried out on this compound?
Experiment 1: adding sodium bicarbonate.
Experiment 2: reduction with hydrogen, then adding iron(III) chloride solution.
Experiment 3: acid hydrolysis.

1. A (1) effervescence occurs and a gas that turns clear limewater milky is given off , (2) the solution turns violet , (3) benzoic acid forms.
2. B (1) no effervescence , (2) the solution turns violet , (3) acetic acid forms.
3. C (1) no effervescence , (2) the colour does not change , (3) glycine forms.
4. D (1) effervescence occurs and a gas that turns clear limewater milky is given off , (2) the solution turns violet , (3) glycine forms.

Three organic compounds (A), (B) and (C) have the molecular formula C₄H₈O₂ (Sample exam 2026)
(A): reacts with cold sodium hydroxide.
(B): does not react with cold sodium hydroxide.
(C): undergoes saponification and produces the simplest alcohol.
Which of the following is correct?

1. A (A) : butyric acid / (B) : ethyl ethanoate.
2. B (C) : propyl methanoate / (B) : methyl propanoate.
3. C (A) : 2-methylpropanoic acid / (C) : ethyl ethanoate.
4. D (C) : methyl propanoate / (B) : butanoic acid.

Which of the following processes is correct for obtaining a compound with the formula CₙHₙO from the compound C₇H₆O₂? (Sample exam 2026)

1. A Basic hydrolysis.
2. B Dehydration.
3. C Acid hydrolysis.
4. D Neutralization.

Which of the following pairs of compounds can be used to produce a polymer (in only three chemical processes) that is used to make arteries and heart valves? (Sample exam 2026)

1. A Ethylene and para-methyltoluene.
2. B Ethylene glycol and terephthalic acid.
3. C Ethanol and para-methyltoluene.
4. D Acetylene and ethanol.

A carboxylic acid has the formula C₃H₆O₃. The following reactions were carried out on it: (Sample exam 2026)
Reaction (1): methanol was added to it, and it reacted as an acid.
Reaction (2): acetic acid was added to it, and it reacted as an alcohol.
Which of the following expresses the product of each of reactions (1) and (2)?

1. A (1) : CH₃CH(OCOCH₃)COOH , (2) : CH₃CH(OH)COOCH₃
2. B (1) : CH₃CH(OH)COOCH₃ , (2) : CH₃CH(OCOCH₃)COOH
3. C (1) : CH₃COOCH₃ , (2) : CH₃CH(OH)COOH
4. D (1) : CH₃CH(OH)COOCH₃ , (2) : CH₃COOCH₃

The acid hydrolysis of propyl formate ester produces a compound (X) that reacts with sodium hydroxide. (Sample exam 2026)
All of the following are properties of compound (X), except ..........

1. A It has no isomers.
2. B Its molecular formula is CH₂O₂
3. C It reacts with hydrohalic acids.
4. D Some insects secrete it.

(X , Y , Z) are three organic compounds: (Sample exam 2026)
(X): the simplest aliphatic hydroxyl compound.
(Y): the simplest aromatic hydroxy carboxylic acid.
(Z): produced by the reaction of (X) and (Y).
Which of the following expresses each of (X , Y , Z)?

1. A (X) : methyl alcohol , (Y) : salicylic acid , (Z) : acetylsalicylic acid
2. B (X) : ethyl alcohol , (Y) : benzoic acid , (Z) : ethyl benzoate ester
3. C (X) : methyl alcohol , (Y) : salicylic acid , (Z) : methyl salicylate ester
4. D (X) : phenol , (Y) : formic acid , (Z) : phenyl formate ester

From the following chart: (Sample exam 2026)
C₆H₆ → alkylation → X → oxidation → Y → (+C₂H₅OH) → Z
Which of the following expresses compound (Z)?

1. A Benzyl ethanoate.
2. B Ethyl benzoate.
3. C Phenyl ethanoate.
4. D Methyl benzoate.

From the following table: (Sample exam 2026)
Experiment 1: compound X + CH₃OH → a compound with a fruity smell.
Experiment 2: compound Y + acidified KMnO₄ → the violet colour disappears.
Experiment 3: compound Z + bromine water → a white precipitate forms.
Which of the following expresses compounds (X , Y , Z)?

1. A (X) : acetic acid , (Y) : 2-propanol , (Z) : carbolic acid.
2. B (X) : carbolic acid , (Y) : 2-methyl-2-propanol , (Z) : acetic acid.
3. C (X) : methanoic acid , (Y) : benzoic acid , (Z) : carbolic acid.
4. D (X) : acetaldehyde , (Y) : 2-propanol , (Z) : carbolic acid.

Which of the following expresses the correct order of the chemical processes needed to prepare propane from propyl propanoate? (Sample exam 2026)

1. A Basic hydrolysis → dry distillation of the acid salt → catalytic hydrogenation.
2. B Basic hydrolysis → dehydration → catalytic hydrogenation.
3. C Acid hydrolysis → oxidation → dehydration.
4. D Acid hydrolysis → oxidation → adding sodium hydroxide.

Which of the following hydroxyl compounds cannot be obtained by the ammonolysis of an isomer of ethyl benzoate? (Sample exam 2026)

1. A CH₃OH
2. B C₆H₅CH₂CH₂OH
3. C C₆H₅CH₂OH
4. D C₂H₅OH

(X , Y , Z) are three hydrocarbon derivatives: (Sample exam 2026)
(X): has the general formula CₙH₂ₙO₂ and reacts with active metals.
(Y): has the general formula CₙH₂ₙO₂ and does not react with active metals.
(Z): has the general formula CₙH₂ₙ₊₂O and reacts with active metals.
If the molar masses of (X , Y , Z) are equal, which of the following is correct about the boiling point?

1. A The boiling point of (Y) is higher than that of (Z).
2. B The boiling point of (Z) is higher than that of (X).
3. C The boiling point of (Y) is higher than that of (X).
4. D The boiling point of (X) is higher than that of (Z).

Three organic compounds used in making polymers: (Sample exam 2026)
(The reaction of the first compound with the second compound) gives a polymer used to treat heart diseases.
(The reaction of the third compound with an aldehyde) gives a polymer used to make ashtrays.
Which of the following expresses each of the three compounds?

1. A First: ethyne , second: hydrogen fluoride , third: Teflon
2. B First: ethylene glycol , second: phthalic acid , third: carbolic acid
3. C First: ethylene glycol , second: terephthalic acid , third: carbolic acid
4. D First: phthalic acid , second: carbolic acid , third: ethylene glycol

Compound (X) has the molecular formula: C₇H₇NO (Sample exam 2026)
Which of the following esters is used to prepare compound (X)?

1. A C₆H₅–COO–CH₃
2. B C₆H₅–OOC–CH₃
3. C C₅H₁₁–COO–CH₃
4. D C₅H₁₁–OOC–CH₃

Three organic compounds (A , B , C): (Sample exam 2026)
When excess sodium hydroxide is added to one mole of each of the three compounds:
(B): uses twice the amount of NaOH that (A) uses.
(C): does not react.
When (A) is heated with (C), a compound used in making flavourings forms.
Which of the following expresses compounds (A , B , C)?

1. A (A) : C₃H₆O₃ , (B) : C₇H₆O₃ , (C) : C₂H₆O
2. B (A) : C₇H₆O₃ , (B) : C₃H₆O₃ , (C) : C₂H₆O
3. C (A) : C₂H₆O , (B) : C₃H₆O₃ , (C) : C₇H₆O₃
4. D (A) : C₃H₆O₃ , (B) : C₂H₆O , (C) : C₇H₆O₃

Which of the following expresses the IUPAC name of the products of the acid hydrolysis of the compound C₆H₅OOCCH₃? (Sample exam 2026)

1. A Acetic acid and hydroxybenzene.
2. B Ethanoic acid and phenol.
3. C Methanol and benzoic acid.
4. D Methyl alcohol and benzoic acid.

Three organic acids (A , B , C): (Sample exam 2026)
(A): produced by the reaction of 3 moles of caustic soda with one mole of 1,1,1-trichloroethane.
(B): produced by the fermentation of milk sugar by some kinds of bacteria.
(C): reacts with methanol, forming a substance used to relieve rheumatic pain.
Which of the following expresses the previous acids?

1. A (A) : C₂H₄O₂ , (B) : C₃H₆O₃ , (C) : C₇H₆O₃
2. B (A) : C₃H₆O₃ , (B) : C₂H₄O₂ , (C) : C₇H₆O₃
3. C (A) : C₂H₄O₂ , (B) : C₇H₆O₃ , (C) : C₃H₆O₃
4. D (A) : C₃H₆O₃ , (B) : C₇H₆O₃ , (C) : C₂H₄O₂

Glycolic acid (hydroxyethanoic acid) has the formula HO–CH₂COOH. The following experiments were carried out on it: (Sample exam 2026)
Experiment (A): reaction with methanol.
Experiment (B): reaction with acetic acid.
Which of the following expresses the chemical formula of the product of each of experiments (A) and (B)?

1. A (A) : HO–CH₂–COOCH₃ , (B) : CH₃COO–CH₂–COOH
2. B (A) : CH₃–COO–CH₂COOH , (B) : HO–CH₂–COOCH₃
3. C (A) : HO–CH₂COOH , (B) : CH₃–COO–CH₂–COO–CH₃
4. D (A) : CH₃O–CH₂COOH , (B) : HO–CH₂COO–CH₃

(A , B , C) are three organic compounds with the following molecular formulas: (Sample exam 2026)
(A) : C₃H₆O₃ , (B) : C₂H₄O₂ , (C) : C₄H₈O₂
The ammonolysis of compound (C) gives the amide of compound (B).
All of the following express reactions of compounds (A , B , C), except ..........

1. A (A) and (B) react with metal carbonates, while (C) does not react with them.
2. B (A) does not react with (B) but reacts with alcohols.
3. C (A) and (B) react with active metals; (C) reacts with metal hydroxides on heating.
4. D One of the isomers of (C) reacts with active metals and their hydroxides, carbonates and bicarbonates.

Which of the following expresses the correct order of the chemical processes needed to obtain propane from a compound with the chemical formula CH₃CH₂COOCH₂CH₂CH₃? (Sample exam 2026)

1. A Basic hydrolysis → dry distillation → catalytic hydrogenation.
2. B Basic hydrolysis → dehydration → catalytic hydrogenation.
3. C Acid hydrolysis → oxidation → dehydration.
4. D Acid hydrolysis → reduction → dehydration.

(X , Y) are organic compounds: (Sample exam 2026)
(X): its molecular formula is C₃H₈O₃
(Y): its general formula is CₙH₂ₙO₂, where (n) is not less than 4
When one mole of (X) reacts with 3 mol of (Y), compound (Z) forms.
Which of the following expresses a use of compound (Z)?

1. A Artificial heart arteries.
2. B Preventing blood clots.
3. C Making soap.
4. D An ointment to relieve rheumatic pain.

Which of the following expresses the structural formula of the compound produced by the reaction of the oxidation product of ethyl alcohol with the reduction product of benzoic acid? (Sample exam 2026)

1. A C₆H₅CH₂OCOCH₃
2. B C₆H₅CH₂COOCH₃
3. C CH₃COOC₆H₅
4. D C₆H₅OCOCH₃

The acid hydrolysis of propyl benzoate produces an acidic compound (X), and when compound (X) reacts with the simplest aliphatic alcohol, compound (Y) is produced. (Sample exam 2026)
Which of the following is an isomer of compound (Y)?

1. A Phenyl formate.
2. B Butyl formate.
3. C Phenyl acetate.
4. D Phenyl benzoate.

Two organic compounds (X , Y): the molecular formula of compound (X) is C₂H₆O₂, while compound (Y) has the formula C₂H₄O₂ (Sample exam 2026)
Which of the following is correct?

1. A Both react with sodium hydroxide.
2. B Both react with hydrohalic acids.
3. C Both can be oxidized by potassium permanganate solution.
4. D When they react together, an ester forms.

Which of the following pairs of compounds react to produce the compound C₂H₅OOCC₆H₅? (1st session 2025)

1. A Phenol and ethanoic acid.
2. B Phenol and propanoic acid.
3. C Benzoic acid and methanol.
4. D Benzoic acid and ethanol.

Three organic compounds: (1st session 2025)
Compound (A): has the formula CₙH₂ₙO₂ and does not react with NaHCO₃
Compound (B): the simplest compound with the formula CₙH₂ₙO that is not oxidized by ordinary oxidizing agents.
Compound (C): has the formula CₙH₂ₙ₊₂O and reacts with sodium.
Which of the following is correct?

1. A The boiling point of (A) is higher than that of (C) with the same molar mass.
2. B Compound (B) is produced by the oxidation of compound (C) and by the reduction of compound (A).
3. C Compound (C) is oxidized to give compound (B) and is used in preparing compound (A).
4. D Compound (A) is the product of the reaction of compound (C) with compound (B).

Which of the following expresses the correct order of the chemical processes used to prepare Dacron fibres? (1st session 2025)

1. A Alkylation of toluene / complete oxidation / esterification.
2. B Catalytic reforming of methylhexane / oxidation / esterification.
3. C Catalytic reforming of heptane / oxidation / esterification.
4. D Catalytic hydration of ethyne / oxidation / esterification.

Four organic compounds: (1st session 2025)
Compound (A) : C₇H₆O₃ • Compound (B) : C₆H₆O
Compound (C) : CH₄O • Compound (D) : C₃H₆O₂
Which of the following is correct?

1. A Compound (B) reacts with compound (C) to form a heat-insulating compound.
2. B Compound (A) reacts with compound (C) to form Dacron fibres.
3. C The acid hydrolysis of compound (D) gives compound (B).
4. D Compound (A) reacts with compound (C) and gives oil of wintergreen.

Which of the following pairs are not isomers? (2nd session 2024)

1. A Ethyl acetate and propanoic acid.
2. B 2-ethyl-1-butene and 2-hexene.
3. C 2-butanol and diethyl ether.
4. D Propanal and acetone.

The molecular formulas of compounds (X) and (Y) are: (2nd session 2024)
(X) : C₄H₈O , (Y) : C₆H₁₂O₂
Which of the following choices expresses the correct IUPAC name of each of them?

1. A (X) : butanol , (Y) : hexanoic.
2. B (X) : butanaldehyde , (Y) : propyl propanoate ester.
3. C (X) : butanal , (Y) : ethyl butanoate ester.
4. D (X) : butanol , (Y) : butyl acetate ester.

The following table shows the boiling points of three organic compounds (X), (Y) and (Z) with the same molar mass: (2nd session 2024)
(X) : 31.8°C , (Y) : 97.8°C , (Z) : 118°C
Which of the following choices expresses these compounds?

1. A (X) : ester , (Y) : acid , (Z) : alcohol.
2. B (X) : acid , (Y) : alcohol , (Z) : ester.
3. C (X) : alcohol , (Y) : acid , (Z) : ester.
4. D (X) : ester , (Y) : alcohol , (Z) : acid.

From the following chart: (2nd session 2024)
Which of the following choices is correct?

1. A Compound (D) is phthalic acid, and compound (E) is an ester used to relieve rheumatic pain.
2. B Compound (B) is ortho-chlorotoluene, and compound (E) is an ester used to relieve headaches.
3. C Compound (D) is salicylic acid, and compound (E) is an ester used to prevent blood clots.
4. D Compound (A) is chlorobenzene, and compound (E) is an ester used to relieve rheumatic pain.

Study the following chart: (2nd session 2024)
The choice that expresses substances (X) and (Y) is ..........

1. A (X) : hydrolysed in an acidic medium, giving a dibasic aromatic acid , (Y) : a monoamide compound.
2. B (X) : hydrolysed in an acidic medium, giving a monohydric aliphatic alcohol , (Y) : a monoamide compound.
3. C (X) : reacts with NaOH, giving a dihydric aromatic alcohol , (Y) : a diamide compound.
4. D (X) : reacts with NaOH, giving a salt that can be used to prepare benzene , (Y) : a diamide compound.

From the opposite chart: (1st session 2023)
Which of the following choices is correct?

1. A Compound (A) does not effervesce when sodium carbonate is added to it.
2. B Compound (B) forms acetamide by ammonolysis.
3. C Compound (A) removes the violet colour of acidified potassium permanganate.
4. D Compound (B) removes the violet colour of acidified potassium permanganate.

(X), (Y) and (Z) are three hydrocarbon derivatives. (Trial exam / March 2023)
(X): can be oxidized and reduced.
(Y): an isomer of an alcohol.
(Z): produced by the reaction of an acid with an alcohol.
Which of the following choices is correct?

1. A (X) : aldehyde , (Y) : ether , (Z) : ester.
2. B (X) : ketone , (Z) : ester.
3. C (X) : aldehyde , (Z) : ether.
4. D (X) : alcohol , (Y) : ester.

From the following charts: (1st session 2024)
If n = 2 in compound A and n = 3 in compound B
Which of the following choices is correct?

1. A When compound (C) combines with compound (D), an isomer of pentanone is produced.
2. B The boiling point of compound (C) is higher than that of compound (D).
3. C When compound (C) combines with compound (D), an isomer of pentanoic acid is produced.
4. D Compound (B) is an isomer of compound (D).

Study the opposite chart: (1st session 2024)
Which of the following choices is correct?

1. A (Y) : ethanol , (W) : propane.
2. B (X) : sodium ethanoate , (Z) : ethene.
3. C (Y) : propanol , (W) : ethane.
4. D (X) : sodium propanoate , (Z) : ethene.

Three organic compounds (A), (B) and (C): when (A) is added to (C), a flavouring is produced; when sodium hydroxide is added to (B) or (C), a reaction takes place; and when sodium hydroxide is added to (A), no reaction takes place. So the three compounds are .......... (Trial exam / June 2021)

1. A (A) : alcohol , (B) : phenol , (C) : acid.
2. B (A) : phenol , (B) : alcohol , (C) : acid.
3. C (A) : acid , (B) : alcohol , (C) : phenol.
4. D (A) : acid , (B) : phenol , (C) : alcohol.

When 1 mol of ethylene glycol reacts with 2 mol of acetic acid, the product is .......... (1st session 2021)

1. A CH₃COO–CH₂–CH₂–OOCCH₃
2. B CH₃OOC–CH₂–CH₂–COOCH₃
3. C CH₃COOC₂H₅
4. D CH₃COO(CH₂)₂CH₃

Water can be obtained from all of the following reactions, except .......... (Trial exam / March 2023)

1. A combustion of ethane.
2. B reaction of propanoic acid with methanol.
3. C adding acidified KMnO₄(aq) to 1-propanol.
4. D polymerization of propylene.

The molecular isomer of the compound C₆H₅COOCH₃ is called .......... (Trial exam / June 2021)

1. A phenyl acetate.
2. B methyl heptanoate.
3. C ethyl hexanoate.
4. D phenyl formate.

Which of the following is an isomer of ethyl pentanoate? (1st session 2021)

1. A Pentyl formate.
2. B Propyl butanoate.
3. C Phenyl benzoate.
4. D Phenyl acetate.

According to the IUPAC system, the opposite compound is called .......... (2nd session 2021)

1. A methyl butanoate.
2. B ethyl propanoate.
3. C propyl acetate.
4. D propyl ethanoate.

Octanoic acid is a fatty acid that is the main component of coconut oil. (1st session 2023)
All of the following are isomers of it, except ..........

1. A hexyl ethanoate.
2. B pentyl propanoate.
3. C butyl butyrate.
4. D butyl pentanoate.

The structural formula in front of you represents the chemical structure of basil ester. (2nd session 2023)
When this compound is saturated and then hydrolysed in an acidic medium, .......... forms.

1. A acetic acid and 3,7-dimethyl-3-octanol
2. B ethanol and 3,7-dimethyloctanoic acid
3. C acetic acid and 2,6-dimethyl-6-octanol
4. D methanol and 3,7-dimethyloctanoic acid

Which of the following pairs are not isomers? (2nd session 2023)

1. A Phenyl acetate ester , ethyl benzoate ester.
2. B Phenyl acetate ester , methyl benzoate ester.
3. C Para-chlorotoluene , chlorophenylmethane.
4. D Phenyl formate , benzoic acid.

The ester that is an isomer of the compound CH₃COOCH₃ can be prepared from .......... (Trial exam / June 2021)

1. A formic acid + ethyl alcohol.
2. B acetic acid + methyl alcohol.
3. C formic acid + methyl alcohol.
4. D acetic acid + ethyl alcohol.

Phenyl methanoate can be obtained, under suitable conditions, from .......... (1st session 2022)

1. A benzoic acid and methanoic acid.
2. B formic acid and picric acid.
3. C formic acid and carbolic acid.
4. D benzoic acid and ethanoic acid.

The correct order of the following compounds according to their boiling points is .......... (Trial exam / June 2021)

1. A Propanoic acid > propanol > methyl acetate.
2. B Propanol > methyl acetate > propanoic acid.
3. C Methyl acetate > propanol > propanoic acid.
4. D Methyl acetate > propanoic acid > propanol.

Hydrogen bonds form between the molecules of the following compounds, except .......... (1st session 2022)

1. A acetic acid.
2. B ethanol.
3. C dihydroxyethane.
4. D ethyl ethanoate.

The following table shows the functional groups of compounds (A), (B) and (C): (2nd session 2022)
(A) : –COOR , (B) : –COOH , (C) : –OH
The correct order of these compounds according to the number of hydrogen bonds between every 2 molecules of the same compound is ..........

1. A B < A < C
2. B C < A < B
3. C C < B < A
4. D A < C < B

When the isomers of the compound C₆H₁₂O₂ are each hydrolysed separately in a basic medium, the alcohol produced that has the highest boiling point is .......... (2nd session 2021)

1. A C₆H₁₃OH
2. B C₂H₅OH
3. C CH₃OH
4. D C₄H₉OH

The following table shows the ways of obtaining compounds (A), (B) and (C) under suitable conditions for each process: (2nd session 2022)
Reactant: ethene , process: oxidation , product: (A)
Reactant: ethene , process: catalytic hydration , product: (B)
Reactant: triglyceride ester , process: basic hydrolysis , product: (C) + the salt of the acid
The order of compounds (A), (B) and (C) according to boiling point is ..........

1. A A < B < C
2. B C < A < B
3. C B < A < C
4. D A < C < B

Butyl ethanoate is hydrolysed in an acidic medium. Which of the following is an isomer of the alcohol produced? (2nd session 2022)

1. A C₃H₇CHO
2. B C₂H₅COCH₃
3. C C₃H₇COOH
4. D C₃H₇OCH₃

From the following chart: (2nd session 2022)
Compounds (A) and (B) are ..........

1. A (A) : an aromatic acid , (B) : a phenol.
2. B (A) : an aromatic acid , (B) : an alcohol.
3. C (A) : an aliphatic acid , (B) : an alcohol.
4. D (A) : an aliphatic acid , (B) : a phenol.

Ester (A) is derived from the oxidation product of toluene. The ammonolysis of this ester produced compounds (C) and (B). (2nd session 2021)
Compound (C) is aromatic and acidic.
Which of the following is correct?

1. A (A) : phenyl benzoate , (B) : benzamide.
2. B (A) : phenyl benzoate , (B) : benzyl alcohol.
3. C (A) : methyl benzoate , (B) : benzamide.
4. D (A) : methyl benzoate , (B) : benzyl alcohol.

From the opposite chart: (Trial exam / March 2023)
The uses of (A) and (B) are ..........

1. A (A) : fuel , (B) : an insulating material in electrical appliances.
2. B (A) : making drugs , (B) : in car radiators.
3. C (A) : in car radiators , (B) : making artificial heart valves.
4. D (A) : making artificial heart valves , (B) : making tubes to replace damaged arteries.

From the opposite reaction chart: (1st session 2022)
Compounds (A) and (B) are ..........

1. A (A) : catechol , (B) : aspirin.
2. B (A) : oil of wintergreen , (B) : aspirin.
3. C (A) : salicylic acid , (B) : methyl salicylate.
4. D (A) : benzoic acid , (B) : methyl benzoate.

An organic compound (A) reacts with an organic compound (B) to produce a substance that has a role in treating heart diseases. (2nd session 2021)
Compounds (A) and (B) are ..........

1. A (A) : terephthalic acid , (B) : ethylene glycol.
2. B (A) : phenol , (B) : formaldehyde.
3. C (A) : phenol , (B) : ethylene glycol.
4. D (A) : glycerol , (B) : sulphuric acid.

From the opposite chart: A + B → C (2nd session 2022)
(A) and (C) react with caustic soda solution under suitable conditions, and (B) does not react with caustic soda solution.
Which of the following choices is correct?

1. A (B) : methanoic acid , (C) : methyl ethanoate.
2. B (A) : phenol , (B) : methanoic acid.
3. C (A) : ethanol , (C) : propanoic acid.
4. D (A) : benzoic acid , (C) : methyl benzoate.

Study the following chart, then answer the following questions: (Sample exam 2026)
(1) What is the common name of compound (A)?
(2) Write the structural formula of the compound produced by the reaction of (B) with C₇H₆O₃
(3) What is the IUPAC name of compound (C)?
(4) Write the structural formula of compound (D).

From the following chart: (Sample exam 2026)
Compound (E) is used as a medical drug, and it is advised to take it with plenty of water to prevent stomach ulcers.
(1) Write the chemical formula of compounds (Z) and (Y).
(2) Write the chemical formula of the acid produced by the acid hydrolysis of compound (F).
(3) State a use of compound (F).

The opposite structural formula of aspirin: (Trial exam / March 2023)
(1) Calculate the number of moles of sodium hydroxide that must be added to complete the reaction with 1 mol of aspirin solution, with heating.
(2) Calculate the number of moles of hydrogen that must be added to aspirin solution to convert it into a neutral aliphatic compound, under suitable conditions.