Alkenes (Olefins) questions

What is the molar mass of the alkene that contains 10 mol of hydrogen atoms?
[C = 12 , H = 1]

1. A 42 g/mol
2. B 56 g/mol
3. C 70 g/mol
4. D 84 g/mol

What is the molecular formula of the second member of the olefin series?

1. A C₂H₂
2. B C₂H₄
3. C C₃H₆
4. D C₃H₄

Ethylene and propylene both have the same ..........

1. A molecular formula.
2. B structural formula.
3. C general formula.
4. D molar mass.

What is the mass of ethene gas that occupies the same volume as 6 g of ethane gas (at STP)?
[C = 12 , H = 1]

1. A 4.67 g
2. B 5 g
3. C 5.6 g
4. D 6 g

The following table shows the number of carbon atoms in the molecules of some hydrocarbons and their molar masses:
(W) : 3 carbon atoms , 42 g/mol
(X) : 4 carbon atoms , 56 g/mol
(Y) : 5 carbon atoms , 72 g/mol
(Z) : 6 carbon atoms , 84 g/mol
All these compounds have the same general formula, except ..........
[C = 12 , H = 1]

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

What is the number of sigma and pi bonds in one mole of ethene?

1. A (σ) : 24.08 × 10²³ / (π) : 12.04 × 10²³
2. B (σ) : 18.06 × 10²³ / (π) : 6.02 × 10²³
3. C (σ) : 30.1 × 10²³ / (π) : 6.02 × 10²³
4. D (σ) : 30.1 × 10²³ / (π) : 12.04 × 10²³

The number of carbon atoms in the molecule of the alkene that contains 10 hydrogen atoms is ..........

1. A 3
2. B 4
3. C 5
4. D 6

From the following chart:
All of the following are correct, except ..........

1. A The chemical activity of compounds (W) is less than that of compounds (X).
2. B The number of H atoms in 1 mol of a compound of (Z) is less than in 1 mol of a compound of (W) with the same number of carbon atoms.
3. C Compounds (Y) tend to react by addition.
4. D All the bonds between C atoms in compounds (Z) are sigma bonds.

An alkene forms open-chain isomers when the number of its carbon atoms is greater than or equal to ..........

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

What is the IUPAC name of the opposite compound?
CH₃–CH=CH–CH₂–CH₃

1. A Pentane.
2. B 3-pentene.
3. C 2-pentene.
4. D Pentylene.

What is the number of sigma and pi bonds in one molecule of 2-methyl-1-butene?

1. A σ : 14 , π : 2
2. B σ : 16 , π : 0
3. C σ : 14 , π : 1
4. D σ : 15 , π : 1

What is the IUPAC name of the opposite compound?

1. A 3-methyl-3-butene.
2. B 2-ethyl-1-propene.
3. C 2-methyl-1-butene.
4. D 1-pentene.

What is the IUPAC name of the opposite compound?

1. A 2-methyl-3-bromo-2-butene.
2. B 3-bromo-2-methyl-2-butene.
3. C 2-bromo-3-methyl-2-butene.
4. D 3-methyl-2-bromo-2-butene.

All of the following are correct names for isomers of pentene, except ..........

1. A 2-methyl-1-butene.
2. B 3-methyl-1-butene.
3. C 2-methyl-2-butene.
4. D 3-methyl-2-butene.

What is the number of methylene groups in 2-pentene?

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

Which of the following correctly describes methylbutene?

1. A Number of sigma bonds: 13 , number of the unsaturated carbon atom: 1 , numbers of the carbon atoms that may carry the branch: (2 or 3)
2. B Number of sigma bonds: 14 , number of the unsaturated carbon atom: 2 , numbers of the carbon atoms that may carry the branch: 4
3. C Number of sigma bonds: 14 , number of the unsaturated carbon atom: 1 , numbers of the carbon atoms that may carry the branch: (2 or 3)
4. D Number of sigma bonds: 15 , number of the unsaturated carbon atom: 2 , numbers of the carbon atoms that may carry the branch: 4

Which of the following chemical formulas gives the largest number of acyclic isomers?

1. A C₄H₉Br
2. B C₄H₈
3. C C₃H₆
4. D C₂H₄Cl₂

1-butene and 2-heptene are alkenes.
Which of the following shows the similarities (✓) and differences (✗) between them?

1. A Chemical activity ✓ , number of methylene groups ✗
2. B Chemical activity ✗ , number of methylene groups ✓
3. C Chemical activity ✗ , number of methylene groups ✗
4. D Chemical activity ✓ , number of methylene groups ✓

What is the number of isomers with the molecular formula C₂BrClFI?

1. A 3
2. B 4
3. C 5
4. D 6

Which of the following is the IUPAC name of the opposite compound?

1. A 3,3,3-trimethyl-1-propene.
2. B 1,1,1-trimethyl-2-propene.
3. C 3,3-dimethyl-1-butene.
4. D 2-methyl-3-butene.

Which of the following is the IUPAC name of the opposite compound?
C₂H₃CH(CH₃)₂

1. A 1,1-dimethyl-2-propene.
2. B 2-vinylpropane.
3. C 3-methyl-1-butene.
4. D 2-methyl-3-butene.

Which of the following is the IUPAC name of the opposite compound?

1. A 4-methyl-2-hexene.
2. B 4-ethyl-2-hexene.
3. C 2-ethyl-3-pentene.
4. D 3-methyl-4-hexene.

What is the IUPAC name of the alkene whose molecule contains 6 carbon atoms and includes 4 methyl groups?

1. A 1,1,2,2-tetramethylethene.
2. B 2,3-dimethyl-2-butene.
3. C 2,2-dimethyl-2-butene.
4. D 1,2-dimethyl-2-butene.

What is the IUPAC name of the compound (CH₃)₂CC(CH₃)₂ ?

1. A 1,1,2,2-tetramethylethene.
2. B 2,3-dimethyl-2-butane.
3. C 2,3-dimethyl-2-butene.
4. D 1,2-dimethyl-2-butene.

What is the number of atoms in one molecule of one of the olefins and also the number of its unsaturated isomers?

1. A 12 atoms / 4 isomers.
2. B 12 atoms / 5 isomers.
3. C 15 atoms / 5 isomers.
4. D 15 atoms / 6 isomers.

What is the IUPAC name of the opposite compound?

1. A 1-bromo-4-propyl-5-hexene.
2. B 1-bromo-3-vinylheptane.
3. C 1-bromo-4-vinylheptane.
4. D 6-bromo-3-propyl-1-hexene.

The molecular formula C₉H₁₈ has more than one structural formula. All of the following are IUPAC names of these compounds, except ..........

1. A 4-ethyl-4-methyl-1-hexene.
2. B 4-ethyl-3-methyl-1-hexene.
3. C 3-ethyl-3-heptene.
4. D 3-ethyl-4-methyl-1-pentene.

A compound was named wrongly: 2-ethyl-5-bromo-5-heptene
What is the correct name of this compound?

1. A 3-bromo-6-ethyl-2-heptene.
2. B 6-bromo-3-methyl-6-octene.
3. C 3-bromo-6-methyl-2-octene.
4. D 4-bromo-1-ethyl-1-methyl-2-hexene.

What is the number of isomers of the dibromo-alkene whose molar mass is 185.8 g/mol?
[C = 12 , H = 1 , Br = 79.9]

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

The process used to prepare ethene from ethanol is ..........

1. A oxidation.
2. B dehydration.
3. C reduction.
4. D addition.

When ethylene gas is prepared, it is passed through sodium hydroxide solution in order to ..........

1. A neutralize the acid and lower the activation energy of the reaction.
2. B absorb water and remove impurities.
3. C neutralize the acid and absorb water.
4. D dry the gas and remove impurities.

When the isomer of dimethyl ether reacts with the main test reagent for the iodide ion at 180°C, .......... is formed.

1. A CH₃CH₂OH₂⁺HSO₄⁻
2. B CH₃CH₂OSO₂OH
3. C CH₃CH₂OCH₂CH₃
4. D H₂C=CH₂

When drops of the hot substance (X) are added to ethanol, it changes into ethene, and to purify the ethene produced it is passed over substance (Y).
Which of the following represents substances (X) and (Y)?

1. A (X) : acidified potassium permanganate solution , (Y) : sodium hydroxide solution
2. B (X) : concentrated sulphuric acid , (Y) : dilute sulphuric acid
3. C (X) : concentrated sulphuric acid , (Y) : sodium hydroxide solution
4. D (X) : sodium hydroxide solution , (Y) : concentrated sulphuric acid

The following figure shows the apparatus for preparing ethene gas in the laboratory:
What are the likely pH values of substances (X) and (Y), respectively, after the reaction ends?

1. A (X) : 3 , (Y) : 7
2. B (X) : 12 , (Y) : 7
3. C (X) : 7 , (Y) : 5
4. D (X) : 9 , (Y) : 9

What happens when the opposite compound is added to water with shaking?

1. A It dissolves in it.
2. B It does not dissolve in it.
3. C The corresponding alcohol is formed.
4. D The pi bonds break.

All of the following are physical properties of ethene gas, except that it ..........

1. A is colourless.
2. B decolourizes KMnO₄
3. C is sparingly soluble in water.
4. D has a boiling point below 0°C

The complete combustion of which of the following substances forms 1 mol of CO₂ gas?

1. A 0.25 mol of ethanol.
2. B 0.5 mol of ethene.
3. C 1 mol of propane.
4. D 1.5 mol of graphite.

1 mol of hydrocarbon (X) burns in (Y) moles of oxygen gas, forming a number of moles of H₂O greater than the number of moles of CO₂
Which of the following represents (X) and (Y), respectively?

1. A Butane / 6 mol O₂
2. B Butene / 6.5 mol O₂
3. C Butane / 6.5 mol O₂
4. D Butene / 6 mol O₂

When 1 mol of the largest gaseous alkene is burnt in excess oxygen and the combustion products are passed for a short time through excess calcium hydroxide solution, a solid substance of mass .......... is formed.
[Ca = 40 , C = 12 , O = 16]

1. A 100 g
2. B 200 g
3. C 300 g
4. D 400 g

Hydrocarbon (X) burns in oxygen according to the following equation:
?X(g) + ?O₂(g) → ?CO₂(g) + nH₂O(l)
If the combustion is carried out in a closed vessel containing 60 mL of oxygen gas and 10 mL of hydrocarbon (X), and after complete combustion and condensation of the water vapour produced, the volume of the gases remaining in the vessel is 50 mL (at STP), and after passing these gases through NaOH solution 30 mL of oxygen gas remain. What is the chemical formula of hydrocarbon (X)?

1. A CH₄
2. B C₂H₆
3. C C₂H₄
4. D C₃H₆

A sample of the compound C₆H₁₂ was burnt completely in excess dry oxygen gas, and the products were passed through the apparatus shown in the opposite figure.
What is the ratio of the increase in mass of tube (P) to that of tube (Q)?
[H = 1 , O = 16 , C = 12]

1. A 9/22
2. B 9/11
3. C 11/9
4. D 22/9

What is the product of the hydrogenation of butene?

1. A Butylene.
2. B Butane.
3. C Methylpropane.
4. D Butyne.

What is the product of the reaction of 1 mol of the opposite compound with 3 mol of hydrogen gas under suitable conditions?

1. A Aromatic benzene.
2. B Cyclohexane.
3. C Normal hexane.
4. D Hexene.

What is the product of the hydrogenation of ethylbutene?

1. A 2-ethylbutane.
2. B 3-ethylbutane.
3. C 2-methylpentane.
4. D 3-methylpentane.

What is the correct order of the chemical processes needed to change ethanol into ethane?

1. A Substitution – thermal decomposition – addition.
2. B Addition – substitution – thermal decomposition.
3. C Elimination – thermal decomposition.
4. D Thermal decomposition – elimination.

When a hydrocarbon reacts with chlorine, only one product is formed.
Which of the following is correct?

1. A The hydrocarbon is an alkane.
2. B The hydrocarbon is a saturated compound.
3. C The reaction is an addition reaction.
4. D The reaction is a substitution reaction.

Which compound decolourizes bromine dissolved in CCl₄ ?

1. A Cyclohexane.
2. B Pentane.
3. C 1-hexene.
4. D Cyclopentane.

The reaction of ethene with bromine is represented by the balanced equation ..........

1. A C₂H₄ + Br₂ → C₂H₃Br + HBr
2. B C₂H₄ + Br₂ → C₂H₄Br₂
3. C C₂H₄ + 2Br₂ → C₂Br₄ + 2H₂
4. D C₂H₄ + 2Br₂ → C₂H₄Br₄

The colour of bromine dissolved in carbon tetrachloride disappears when it is added to the compound ..........

1. A CH₃CH₂CH₂CH₂CH₂CO₂H
2. B CH₃CH₂CH₂CH₂CH₂CH₃
3. C CH₃CHCHCH₂CH₂CH₂OH
4. D CH₃CH₂CH₂CO₂CH₂CH₃

The opposite compound is produced from the reaction of compound (X) with bromine dissolved in carbon tetrachloride.
What is the structural formula of compound (X)?

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

What is the chemical formula of the liquid hydrocarbon that decolourizes bromine dissolved in carbon tetrachloride?

1. A C₂H₄
2. B C₄H₈
3. C C₇H₁₆
4. D C₁₀H₂₀

One mole of hydrocarbon (X) reacts by addition with three moles of bromine dissolved in carbon tetrachloride.
What is the molecular formula of hydrocarbon (X)?

1. A C₃H₆
2. B C₄H₆
3. C C₅H₈
4. D C₆H₈

A liquid organic compound (A), whose elements are C, H and O, gives a colourless gas that decolourizes bromine dissolved in carbon tetrachloride when heated to 180°C with concentrated sulphuric acid.
What is the chemical formula of compound (A)?

1. A C₂H₅OH
2. B C₆H₅OH
3. C C₂H₅CHO
4. D CH₃COCH₃

A hydrocarbon whose molecule includes 6 carbon atoms and 3 (C=C) bonds.
What is the molecular formula of the compound produced from its reaction with excess bromine dissolved in CCl₄ ?

1. A C₆H₁₀Br₃
2. B C₆H₈Br₃
3. C C₆H₈Br₆
4. D C₆H₁₄

A 2.1 g sample of an unsaturated hydrocarbon whose molecule contains one double bond reacts completely with 8 g of Br₂
What is the molecular formula of this hydrocarbon?
[C = 12 , H = 1 , Br = 80]

1. A C₅H₁₀
2. B C₃H₆
3. C C₄H₈
4. D C₄H₆

0.15 mol of an unsaturated organic compound reacts completely with 0.3 mol of iodine I₂
What is the number of (C=C) bonds in one mole of this compound?

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

Which of the following represents an open-chain hydrocarbon?

1. A C₈H₁₈ , boiling point 126°C , reaction with bromine ✓
2. B C₈H₁₆ , boiling point 122.5°C , reaction with bromine ✗
3. C C₄H₁₀ , boiling point 36°C , reaction with bromine ✗
4. D C₄H₈ , boiling point −6.5°C , reaction with bromine ✓

What is the formula of the compound produced from the reaction of a symmetrical alkene with Cl₂ ?

1. A CH₃(CHCl)₂CH₃
2. B CH₂ClCHClCH₂CH₃
3. C CH₃CHClCH₂Cl
4. D CH₃CCl₂CH₂CH₃

What is the product of the reaction of 2-methylpropene with HBr ?

1. A 1-bromobutane.
2. B 1-bromo-2-methylpropane.
3. C 2-bromobutane.
4. D 2-bromo-2-methylpropane.

The three opposite equations represent addition reactions:
Which of these reactions are correct?

1. A Reaction (1) ✓ , reaction (2) ✗ , reaction (3) ✓
2. B Reaction (1) ✗ , reaction (2) ✓ , reaction (3) ✗
3. C Reaction (1) ✓ , reaction (2) ✗ , reaction (3) ✗
4. D Reaction (1) ✗ , reaction (2) ✗ , reaction (3) ✓

Which of the following are applications of Markovnikov's rule?
Reaction (1): propene + HBr → 1-bromopropane
Reaction (2): vinyl chloride + HI → 1-chloro-2-iodoethane

1. A Reaction (1) ✓ , reaction (2) ✗
2. B Reaction (1) ✗ , reaction (2) ✗
3. C Reaction (1) ✓ , reaction (2) ✓
4. D Reaction (1) ✗ , reaction (2) ✓

What is the product of adding HBr to 3-methyl-1-butene ?

1. A CH₃CHBrCH(CH₃)₂
2. B CH₃CH₂CBr(CH₃)₂
3. C CH₃CHBrCHCH₃
4. D BrCH₂CH₂CH(CH₃)₂

Which alkene reacts with HBr forming an alkane derivative that includes 3 methyl groups?

1. A 2-propene.
2. B 2-butene.
3. C 2-methyl-2-butene.
4. D 3,3-dimethyl-1-butene.

An olefin whose molecule contains 4 carbon atoms.
How many of its isomers react with HCl according to Markovnikov's rule?

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

The opposite reaction: C₃H₇OH → A + H₂O
All of the following describe compound (A), except that it ..........

1. A can be changed into a saturated compound.
2. B reacts with Br₂ and gives 1,2-dibromopropane.
3. C follows Markovnikov's rule when it reacts with Br₂
4. D has no open-chain isomer.

Alkenes take part in all the following reactions, except ..........

1. A halogenation.
2. B hydrogenation.
3. C catalytic hydration.
4. D hydrolysis.

All of the following are properties of alkenes, except that they ..........

1. A decolourize bromine dissolved in CCl₄
2. B react with hydrogen forming the corresponding alkanes.
3. C contain only the elements carbon and hydrogen.
4. D form organic acids by catalytic hydration.

Alkenes can be changed into alcohols by ..........

1. A hydrolysis by dilute H₂SO₄ acid only.
2. B adding water in the presence of KOH(aq) only.
3. C hydrolysis by dilute H₂SO₄ acid or adding water in the presence of KOH(aq)
4. D oxidation by KMnO₄ in an alkaline medium or adding water in the presence of H₂SO₄ acid

Which of the following reactions of ethene is not an addition process?

1. A The reaction with bromine.
2. B The reaction with hydrogen.
3. C The reaction with oxygen.
4. D The reaction with water.

The catalytic hydration of 2-methylpropene in an acidic medium gives ..........

1. A CH₃(CH₂)₃OH
2. B CH₃COH(CH₃)₂
3. C CH₂OHCH(CH₃)₂
4. D CH₃CHOHC₂H₅

The catalytic hydration of hydrocarbon (X) forms a compound of molecular formula C₂H₆O, and when 14 g of substance (X) is burnt completely in air, two substances are formed.
What is the number of molecules of the product that is used to dilute concentrated solutions?
[C = 12 , H = 1]

1. A 6.02 × 10²³
2. B 12.04 × 10²³
3. C 6.02 × 10²²
4. D 12.04 × 10²²

Which of the following describes the properties of one of the following alkenes?

1. A Propylene: decolourizes bromine ✓ , symmetrical alkene ✗ , changes into an alcohol by catalytic hydration ✗
2. B 1-butene: decolourizes bromine ✗ , symmetrical alkene ✗ , changes into an alcohol by catalytic hydration ✓
3. C Ethylene: decolourizes bromine ✓ , symmetrical alkene ✓ , changes into an alcohol by catalytic hydration ✓
4. D 2-butene: decolourizes bromine ✗ , symmetrical alkene ✓ , changes into an alcohol by catalytic hydration ✗

What chemical processes are needed to change the isomer of the simplest aliphatic ether into a hydrocarbon whose molecular mass is greater than that of the main component of natural gas by 14 g ?
[C = 12 , H = 1]

1. A Substitution – hydrolysis – addition.
2. B Hydrolysis – addition – substitution.
3. C Substitution – thermal decomposition – addition.
4. D Thermal decomposition – addition – substitution.

Baeyer's reagent is potassium permanganate solution in a(n) .......... medium.

1. A alkaline
2. B acidic
3. C neutral
4. D alcoholic

Which of the following shows the importance of Baeyer's reagent?

1. A Detecting a double bond.
2. B Reduction processes.
3. C Oxidation processes.
4. D Detecting methane.

Which of the following compounds decolourizes potassium permanganate solution in an alkaline medium?

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

Treating ethene with potassium permanganate in an alkaline solution gives ..........

1. A ethanol.
2. B ethylene glycol.
3. C acetic acid.
4. D water and carbon dioxide.

What is the reagent used to distinguish between the two opposite compounds (1) and (2)?

1. A Chlorine gas.
2. B Hydrogen peroxide solution.
3. C Hydrogen gas.
4. D Baeyer's reaction.

All of the following describe treating an olefin with an alkaline solution of the compound used as an oxidizing agent and disinfectant, except ..........

1. A an oxidation process.
2. B an addition process.
3. C breaking the pi bond.
4. D a substitution process.

Adding ethylene glycol to water causes ..........

1. A raising its boiling and freezing points.
2. B lowering its boiling and freezing points.
3. C raising its boiling point and lowering its freezing point.
4. D lowering its boiling point and raising its freezing point.

From the following statements:
(1): It prevents the formation of the hexagonal shape in ice crystals.
(2): Its molecules are linked to each other by hydrogen bonds.
(3): It freezes at a temperature below 0°C
Which of the following represents the statements that explain the role of ethylene glycol when it dissolves in water?

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

Which of the following represents one of the reactions of propene and the compound produced?

1. A Substance added: bromine dissolved in CCl₄ , compound produced: 2-bromopropane
2. B Substance added: acidified potassium permanganate solution , compound produced: CH₂OHCH₂CH₂OH
3. C Substance added: hydrogen chloride , compound produced: 2-chloropropane
4. D Substance added: steam , compound produced: CH₃CH₂CH₂OH

Large numbers of molecule (X) link in reaction (Y) to produce a long chain of molecule (Z).
Which of the following is correct?

1. A (X) : polymer , (Y) : addition , (Z) : monomer.
2. B (X) : monomer , (Y) : addition , (Z) : polymer.
3. C (X) : polymer , (Y) : cracking , (Z) : monomer.
4. D (X) : monomer , (Y) : cracking , (Z) : polymer.

When excess ethene gas is heated at 400°C under high pressure, .......... is formed.

1. A carbon and hydrogen
2. B polyethylene
3. C methane and hydrogen
4. D butene

Which of the following is common to ethene and polyethene?

1. A The molar mass.
2. B The presence of π bonds.
3. C The boiling point.
4. D The presence of σ bonds.

The opposite polymer can be produced from the monomer ..........

1. A CF₃CCl₂F
2. B CF₂CClF
3. C CF₃CClHF
4. D CF₂CF₂

Which of the following represents the polymer produced from the polymerization of the second member of the alkenes?

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

The polymer –CH₂CCl₂CH₂CCl₂– is formed from the polymerization of the monomer ..........

1. A HC=CCl
2. B ClHC=CClH
3. C Cl₂C=CH₂
4. D H₂C=CClH

Which of the following describes addition polymerization and condensation polymerization?

1. A Addition: its monomer molecules contain a C=C bond and form the polymer only , condensation: its monomer molecules contain a C=C bond and form the polymer only
2. B Addition: its monomer molecules contain a C=C bond and form the polymer only , condensation: its monomer molecules react to form a polymer and a simple molecule
3. C Addition: its monomer molecules react to form a polymer and a simple molecule , condensation: its monomer molecules contain a C=C bond and form the polymer only
4. D Addition: its monomer molecules react to form a polymer and a simple molecule , condensation: its monomer molecules react to form a polymer and a simple molecule

The opposite figure represents the polymer formed from the acid CH₂=CHCOOH
What type of reaction formed this polymer?

1. A Addition polymerization.
2. B Condensation polymerization.
3. C Dehydration.
4. D Substitution.

The opposite figure shows a section of a polymer.
What is the name of the monomer used to produce this polymer?

1. A Ethylbenzene.
2. B Vinylethene.
3. C Methylbenzene.
4. D Vinylbenzene.

The polymer shown in the opposite figure has a molar mass of 10080 g/mol
What is the number of monomer units used to form one mole of this polymer?
[C = 12 , H = 1]

1. A 180
2. B 360
3. C 625
4. D 710

The reaction of hydrogen peroxide with the monomer of the polymer used in making carpets gives ..........

1. A an organic acid.
2. B an alcohol.
3. C an alkane.
4. D an ether.

All of the following are properties of the monomer used in making floor insulators, except ..........

1. A it reacts with HCl according to Markovnikov's rule.
2. B it is not affected by H₂O₂ solution
3. C it decolourizes bromine dissolved in CCl₄
4. D it reacts with chlorine forming 1,1,2-trichloroethane.

The opposite figure shows a section of a polymer molecule.
What monomer is used to produce this polymer by addition?

1. A 1,3-dichloro-2-butene.
2. B Chloroethene.
3. C 2-chloroethene.
4. D 2,3-dichloro-2-butene.

What is the monomer used to prepare the polymer shown in the opposite figure?

1. A CHCl=CH–CH₃
2. B CH₂=C(Cl)CH₃
3. C (CH₃)₂CHCl
4. D CH₂=CHCl

The opposite polymer is produced from the polymerization of the compound ..........

1. A C₂H₄
2. B C₃H₆
3. C C₄H₈
4. D C₅H₁₀

The opposite section represents part of a polymer.
–CH₂–CHCl–CH₂–CHCl–
Which of the following represents the name of this polymer?

1. A Poly(2-chloropropane) ✓ , poly(chloroethene) ✓ , PVC ✓
2. B Poly(2-chloropropane) ✗ , poly(chloroethene) ✓ , PVC ✗
3. C Poly(2-chloropropane) ✗ , poly(chloroethene) ✓ , PVC ✓
4. D Poly(2-chloropropane) ✓ , poly(chloroethene) ✗ , PVC ✓

The compound with the highest boiling point in the butagas mixture is produced from the hydrogenation of two alkene isomers.
Which of the following represents one of these two isomers?

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

From the following chart:
Alcohol with boiling point 78.4°C → hydrocarbon (A) → saturated hydrocarbon (B)
All of the following are correct, except ..........

1. A (A): decolourizes bromine , (B): prepared by dry distillation.
2. B (A): chemically active , (B): relatively chemically inactive.
3. C (A): reacts by addition , (B): reacts by substitution.
4. D (A): cannot be polymerized , (B): can be polymerized.

How can you distinguish between the compound C₄H₈ and the compound C₄H₁₀ by a practical experiment? State the type of reaction that takes place.

Monomer (X) is used to produce a polymer that is flexible and not affected by chemicals, and this polymer is used to make plastic sheets.
Write the balanced chemical equation for obtaining each of the following from monomer (X):
(1) a monohydric alcohol.
(2) a dihydric alcohol.

The opposite structural formula represents an organic compound: CH₃–CH₂–CH=CH–CH₃
(1) Write the IUPAC name of this compound.
(2) Classify this compound by completing the following chart:

State two reasons why PVC is preferred to iron for making water pipes.

Compare addition polymerization and condensation polymerization in terms of:
(1) the monomers used.
(2) the mass of the polymer produced compared with the mass of the monomers used.

Draw the structural formula of each of the following:
(1) 2-hexene.
(2) 4-chloro-1-butene.

Of the hydrocarbon compounds:
• Compound (1): 2,5,7-trimethyl-3-octene.
• Compound (2): 2,3-dimethyl-1-pentene.
(1) Draw the structural formula of the compound with the higher boiling point.
(2) What is the number of methyl groups in the compound with the lower boiling point?

State the number of unsaturated isomers of the molecular formula C₅H₁₀ that have:
(1) a straight chain.
(2) a branched chain.

Show by symbolic equations how to obtain 1,2-dibromoethane from ethanol.

What is the name of the saturated compound produced from the reaction of hydrogen chloride with the compound H₃C–CH=C(CH₃)₂ ?

Normal hexane and 2-hexene are aliphatic hydrocarbons. Compare them in terms of:
(1) their classification as open-chain compounds.
(2) the general formula.

Which of the following represents the correct role of sodium hydroxide in preparing paraffins and the role of concentrated sulphuric acid in preparing olefins, respectively? (Sample exam 2026)

1. A Removing water from alcohols in preparing olefins, and a flux in preparing paraffins.
2. B It removes the carboxylate group in preparing olefins and removes water in preparing paraffins.
3. C It removes the carboxylate group in preparing paraffins and removes water in preparing olefins.
4. D It absorbs water vapour in preparing paraffins and neutralizes the acid vapours in preparing olefins.

Which of the following represents the number of alkene isomers that contain an ethyl group and have the molecular formula C₅H₁₀ ? (Sample exam 2026)

1. A 6
2. B 5
3. C 4
4. D 3

Two compounds (X) and (Y), each with the formula shown: (Sample exam 2026)
(X) : (C₂H₅)C₂H(CH₃)₂
(Y) : CH₃CHC(CH₃)₂
Which of the following gives the IUPAC names of the compounds produced from adding hydrogen bromide to compounds (X) and (Y)?

1. A Product of (X): 2-bromo-2-methylpentane , product of (Y): 2-bromo-2-methylbutane
2. B Product of (X): 2-bromo-2-methylpentane , product of (Y): 2-bromo-3-methylpentane
3. C Product of (X): 2-bromo-4-methylbutane , product of (Y): 1-bromo-3-methylbutane
4. D Product of (X): 2-bromo-3-methylbutane , product of (Y): 2-bromo-2-methylbutane

Which of the following is the correct IUPAC name of a compound with the general formula CₙH₂ₙ₋₂BrCl ? (Sample exam 2026)

1. A 3-bromo-1-chloropropyne.
2. B 1-bromo-3-chloropropene.
3. C 2-bromo-1-chlorobutane.
4. D 1-chloro-2-bromo-2-butene.

The opposite figure is of a polymer: (Sample exam 2026)
Which of the following describes the properties of the monomer of this polymer?

1. A It reacts by addition according to Markovnikov's rule.
2. B It reacts with HBr and gives 1-bromobutane.
3. C It reacts by catalytic hydration and gives 2-butanol.
4. D It reacts with bromine and gives 1,2-dibromobutane.

Which of the following is the IUPAC name of the opposite compound? (Sample exam 2026)

1. A 3-propyl-2-phenyl-2-butene.
2. B 2,3-dimethyl-4-phenyl-3-pentene.
3. C 3,4-dimethyl-2-phenyl-2-pentene.
4. D 2-phenyl-3-methyl-2-hexene.

Two organic compounds (A) and (B) are open-chain hydrocarbons. When a mole of compound (A) burns, 3 mol of CO₂ are produced, while when a mole of compound (B) burns, 5 mol of H₂O are produced. (Sample exam 2026)
If you know that (A) reacts by substitution, while (B) reacts by addition in one step, then ..........

1. A (A): gaseous alkane , (B): liquid alkane.
2. B (A): liquid alkane , (B): liquid alkene.
3. C (A): gaseous alkane , (B): liquid alkene.
4. D (A): gaseous alkene , (B): liquid alkyne.

The following table gives the molecular formulas of three hydrocarbons (A), (B) and (C): (2nd session 2024)
(A) : C₃H₆ , (B) : C₃H₄ , (C) : C₃H₈
Which of the following choices is correct?

1. A (C) is an unsaturated hydrocarbon and is used in making hoses.
2. B (A) is an unsaturated hydrocarbon and is used in making cooking pots.
3. C (B) is a saturated hydrocarbon and is used in welding and cutting metals.
4. D (A) is an unsaturated hydrocarbon and is used in making carpets.

The number of methylene groups in 2,2-dimethylbutane equals the number of methyl groups in .......... (2nd session 2021)

1. A propene.
2. B propane.
3. C pentane.
4. D ethyne.

The correct IUPAC name of the opposite compound is .......... (1st session 2023)

1. A 3-methyl-1-pentene.
2. B 2-methylbutane.
3. C 2-ethylbutane.
4. D 3-methyl-4-pentene.

Two organic compounds (A) and (B) are open-chain hydrocarbons; compound (A) has 3 carbon atoms and compound (B) has 6 carbon atoms, and compound (B) is chemically more active than compound (A). (2nd session 2021)
(A) and (B) are ..........

1. A (A) a gaseous alkane , (B) a liquid alkene.
2. B (A) a liquid alkane , (B) a liquid alkene.
3. C (A) a gaseous alkane , (B) a gaseous alkene.
4. D (A) a gaseous alkane , (B) a liquid alkane.

When one mole of an alkane (X) and of an alkene (Y) are burnt completely, each on its own, the number of moles of water vapour produced from (X) and (Y) is .......... (1st session 2021)
«where n is the number of carbon atoms»

1. A from X (n + 1) , from Y (n)
2. B from X (n − 1) , from Y (n + 1)
3. C from X (3n + 1)/2 , from Y (3n)/2
4. D from X (3n + 1) , from Y (3n)

When 1 mol of ethene reacts with excess chlorine, the number of moles of chlorine needed to obtain a halogen compound containing no hydrogen (under the conditions suitable for these reactions) equals .......... (2nd session 2021)

1. A 1 mol
2. B 5 mol
3. C 2.5 mol
4. D 1.5 mol

The following reactions take place under suitable conditions to obtain compounds (A), (B) and (C) as follows: (1st session 2021)
R–CH₂OH → (strong mineral acid) (A) → (Δ) (B) → (hydrogenation) (C)
If you know that (B) follows Markovnikov's rule, then compounds (A), (B) and (C) are ..........

1. A (A) ethyl hydrogen sulphate , (B) ethene , (C) ethane.
2. B (A) ethene , (B) ethyl hydrogen sulphate , (C) ethane.
3. C (A) propyl hydrogen sulphate , (B) propene , (C) propane.
4. D (A) propene , (B) propane , (C) propyl hydrogen sulphate.

When potassium permanganate solution in an alkaline medium was added to substances (A) and (B), each on its own, the colour disappeared with substance (A) only and did not disappear with substance (B). (Trial exam / June 2021)
Which of the following is correct?

1. A Compound (A) is 2-methyl-2-pentene and the addition took place at carbon atoms 2 and 3
2. B Compound (A) is 2-methyl-2-pentene and the addition took place at carbon atoms 1 and 2
3. C Compound (B) is propene and the addition took place at carbon atoms 2 and 3
4. D Compound (B) is propene and the addition took place at carbon atoms 1 and 2

The reaction of 1-butene with (colourless) hydrogen peroxide is a(n) .......... (2nd session 2021)

1. A oxidation-reduction reaction and is considered a test for the double bond.
2. B oxidation reaction only and is not considered a test for the double bond.
3. C oxidation-reduction reaction and is not considered a test for the double bond.
4. D oxidation reaction only and is considered a test for the double bond.

The reaction of ethene gas with potassium permanganate solution in an alkaline medium is .......... (2nd session 2022)

1. A oxidation-reduction, and the reaction is not considered a test for the double bond.
2. B oxidation-reduction, and the reaction is considered a test for the double bond.
3. C oxidation only, and the reaction is considered a test for the double bond.
4. D oxidation only, and the reaction is not considered a test for the double bond.

An olefin has a total of (18) atoms in one molecule, so the number of its unbranched isomers is .......... (1st session 2022)

1. A 13
2. B 6
3. C 4
4. D 3

The number of methylene groups in ethylbutene equals .......... (1st session 2021)

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

The correct IUPAC name of the compound 2-bromo-5-ethyl-4-hexene is .......... (Trial exam / May 2021)

1. A 6-bromo-3-methyl-3-heptene.
2. B 6-bromo-2-ethyl-2-hexene.
3. C 2-bromo-5-methyl-4-heptene.
4. D 2-bromo-5-ethyl-4-pentene.

The structural formula of 2-methyl-2-butene is .......... (2nd session 2022)

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

An aliphatic hydrocarbon derivative containing the group (>CH–OH) reacts with a concentrated strong mineral acid to prepare an unsymmetrical alkene; the alkene is .......... (Trial exam / June 2021)

1. A propene.
2. B 2-butene.
3. C ethene.
4. D 2-methylpropene.

The opposite compound, according to IUPAC, is named .......... (1st session 2022)

1. A 2-phenyl-3-methyl-2-butene.
2. B 2,3-dimethyl-2-nonene.
3. C 2-methyl-3-phenylbutene.
4. D 2-methyl-3-phenyl-2-butene.

The correct IUPAC name of the opposite compound is .......... (Trial exam / March 2023)

1. A 4,5-dimethyldecane.
2. B 2-phenyl-3-methyl-2-hexene.
3. C 3-methyl-2-phenyl-2-hexene.
4. D 2-propyl-3-phenylbutane.