Aromatic Benzene questions

All of the following are true for aromatic compounds, except ..........

1. A They have distinctive odours.
2. B Some of them have a cyclic shape.
3. C They may be monocyclic or polycyclic.
4. D The simplest of them is benzene.

The lengths of the bonds between the carbon atoms are intermediate between single and double bonds in the compound ..........

1. A 2-butene.
2. B propyne.
3. C 1-butene.
4. D aromatic benzene.

The ratio of the number of sigma bonds to the number of pi bonds in aromatic benzene equals ..........

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

Naphthalene agrees with aromatic benzene in all of the following, except ..........

1. A their high percentage of carbon.
2. B both are hydrocarbons.
3. C the physical state.
4. D both are aromatic compounds.

What is the IUPAC name of the opposite hydrocarbon?

1. A 2-cyclohexylpentane.
2. B 2-phenylpentane.
3. C 3-cyclohexylpentane.
4. D 3-phenylpentane.

What is the name of the opposite compound according to the IUPAC system?

1. A 3,5-dimethyldecane.
2. B 2-ethyl-3-methylnonane.
3. C 2-ethyl-3-phenylbutane.
4. D 3-methyl-2-phenylpentane.

What is the name of the opposite compound according to the IUPAC system?

1. A 1,4-diphenylpentane.
2. B diphenylpentane.
3. C 1,3-diphenylbutane.
4. D 2,3-diphenylbutane.

What is the name of the opposite compound according to the IUPAC system?

1. A 1,2-diphenylpropene.
2. B 1,3-diphenylpropene.
3. C 1,2-diphenylpropane.
4. D 1,3-diphenylpropane.

What is the IUPAC name of the opposite compound?

1. A 1-nitro-3-bromo-4-chlorobenzene.
2. B 2-bromo-1-chloro-4-nitrobenzene.
3. C 1-bromo-2-chloro-5-nitrobenzene.
4. D 1-bromo-2-chloro-4-nitrobenzene.

What is the IUPAC name of the opposite compound?

1. A 4-chloro-1,3-dinitrobenzene.
2. B 2,4-dinitro-1-chlorobenzene.
3. C 1,3-dinitro-4-chlorobenzene.
4. D 1-chloro-2,4-dinitrobenzene.

What is the IUPAC name of the opposite compound?

1. A 1,3-dimethyl-4-nitrobenzene.
2. B 1-nitro-3,4-dimethylbenzene.
3. C 2,4-dimethyl-1-nitrobenzene.
4. D 1-nitro-4,6-dimethylbenzene.

What is the IUPAC name of the opposite compound?

1. A 3-chloro-6-methylphenol.
2. B 1-hydroxy-2-methyl-5-chlorobenzene.
3. C 1-chloro-4-methylphenol.
4. D 4-chloro-2-hydroxy-1-methylbenzene.

What is the IUPAC name of the opposite compound?

1. A 1-ethyl-3-nitro-4-fluorobenzene.
2. B 1-fluoro-4-ethyl-2-nitrobenzene.
3. C 4-ethyl-1-fluoro-2-nitrobenzene.
4. D 1-fluoro-2-nitro-4-ethylbenzene.

The opposite compound is a disubstituted benzene derivative.
Which of the following expresses the name of this compound?

1. A 3-nitrotoluene , 3-methyl-1-nitrotoluene.
2. B para-nitrotoluene , 3-nitrotoluene.
3. C 3-methylnitrotoluene , meta-methylnitrobenzene.
4. D 3-nitrotoluene , 1-methyl-3-nitrobenzene.

What is the IUPAC name of the compound meta-bromotoluene?

1. A 1-bromo-3-methylbenzene.
2. B 1-methyl-3-bromobenzene.
3. C 1-bromo-5-methylbenzene.
4. D 1-methyl-5-bromobenzene.

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

1. A Toluene is called methylbenzene.
2. B Ethylbenzene is called phenylethane.
3. C Naphthalene is called biphenyl.
4. D ortho-chlorotoluene is called 1-chloro-2-methylbenzene.

The opposite compound can be prepared by ..........

1. A chlorinating benzene, then nitrating the product.
2. B nitrating benzene, then chlorinating the product.
3. C reacting chlorobenzene with nitrous acid.
4. D reacting benzene with nitrous acid, then chlorinating the product.

Benzene is converted into meta-chloronitrobenzene by the two processes ..........

1. A halogenation, then nitration.
2. B substitution, then addition.
3. C nitration, then halogenation.
4. D addition, then substitution.

When chlorobenzene is chlorinated, .......... is formed.

1. A ortho-dichlorobenzene
2. B a mixture of ortho- and para-dichlorobenzene
3. C meta-dichlorobenzene
4. D a mixture of ortho-, para- and meta-trichlorobenzene

A cyclic compound (X) has the molecular formula C₇H₈ and a saturated cyclic compound (Y) has the molecular formula C₇H₁₄
What is the number of sigma bonds in each of the compounds (X) and (Y)?

1. A (X) : 10 bonds , (Y) : 10 bonds.
2. B (X) : 10 bonds , (Y) : 11 bonds.
3. C (X) : 15 bonds , (Y) : 20 bonds.
4. D (X) : 15 bonds , (Y) : 21 bonds.

From the structural formulas of the following compounds:
Which hydrocarbons are isomers?

1. A Compounds (1) , (2) , (3).
2. B Compounds (2) , (3) , (4).
3. C Compounds (1) , (3) , (4).
4. D Compounds (1) , (2) , (4).

What is the number of aromatic isomers with the molecular formula C₈H₁₀?

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

What is the number of aromatic isomers with the molecular formula C₆H₄Br₂?

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

Which of the following is true for aromatic benzene?

1. A The positions of the π bonds in it do not change.
2. B It is an unsaturated compound that reacts by addition only.
3. C The electrons of the π bonds are not localized on specific carbon atoms.
4. D When one hydrogen atom in it is replaced by a chlorine atom, it can form 3 isomers.

Coal tar is a main source of .......... compounds.

1. A aromatic
2. B aliphatic
3. C saturated cyclic
4. D heterocyclic

The organic solvent whose boiling point is 80°C, which is obtained from coal tar and used to dissolve fats, is ..........

1. A propane.
2. B aromatic benzene.
3. C toluene.
4. D 1,1,1-trichloroethane.

From the opposite chart:
Coal → process (1) → black liquid (A) → process (2) → clear liquid (B)
Which of the following expresses each of (1) , (2) , (A) , (B)?

1. A (1) destructive distillation , (2) fractional distillation , (A) coal tar , (B) coke
2. B (1) fractional distillation , (2) destructive distillation , (A) the simplest aliphatic hydrocarbon , (B) coke
3. C (1) destructive distillation , (2) fractional distillation , (A) coal tar , (B) the simplest aromatic hydrocarbon
4. D (1) fractional distillation , (2) destructive distillation , (A) the simplest aromatic hydrocarbon , (B) coal tar

The following chart shows some balanced reactions that take place under suitable conditions:
Which of the following is correct?

1. A (X) can be obtained by strongly heating compound (Z) in air.
2. B From (Y) a compound with an aromatic odour can be obtained.
3. C (Z) is heated at 500°C, forming carbon black.
4. D (Y) burns in excess oxygen gas, forming (X).

What are the suitable conditions for the successive chemical processes that convert a saturated aliphatic hydrocarbon of molar mass 16 g/mol into a saturated hydrocarbon of molar mass 84 g/mol?
[C = 12 , H = 1]

1. A heating then cooling - a nickel tube heated to redness - pressure, heat and catalysts.
2. B pressure, heat and catalysts - heating then cooling - a nickel tube heated to redness.
3. C a nickel tube heated to redness - pressure, heat and catalysts - heating then cooling.
4. D pressure, heat and catalysts - a nickel tube heated to redness - heating then cooling.

The opposite figure shows the carbon skeleton of alkane (X). When the straight-chain isomer of compound (X) undergoes catalytic reforming, compound (Y) is formed.
What is the IUPAC name of each of compounds (X) and (Y), respectively?

1. A (X) : 3,4-dimethylhexane / (Y) : 1,2-dimethylbenzene.
2. B (X) : 2-ethyl-3-methylpentane / (Y) : 1,2-dimethylbenzene.
3. C (X) : 3,4-dimethylhexane / (Y) : methylbenzene.
4. D (X) : 2-ethyl-3-methylpentane / (Y) : methylbenzene.

What are the products of the catalytic reforming of normal heptane and normal octane?

1. A normal heptane : toluene , normal octane : ethylbenzene
2. B normal heptane : ethylbenzene , normal octane : toluene
3. C normal heptane : toluene , normal octane : benzene
4. D normal heptane : benzene , normal octane : ethylbenzene

Benzene can be prepared by the following methods, except ..........

1. A phenol : reduction.
2. B benzoic acid : neutralization then dry distillation.
3. C normal hexane : catalytic reforming.
4. D ethene : trimerization.

When gas (X) is trimerized, compound (Y) is formed, which gives compound (Z) when it is hydrogenated.
Which of the following expresses the type of reactions that convert compound (X) into (Z)?

1. A converting (X) into (Y) : addition , converting (Y) into (Z) : substitution
2. B converting (X) into (Y) : substitution , converting (Y) into (Z) : substitution
3. C converting (X) into (Y) : substitution , converting (Y) into (Z) : addition
4. D converting (X) into (Y) : addition , converting (Y) into (Z) : addition

Which of the following is a reason why aromatic benzene reacts with difficulty?

1. A Its cyclic structure.
2. B The ring contains 6 carbon atoms.
3. C Its six electrons are not localized on specific carbon atoms.
4. D The ring contains 6 hydrogen atoms.

From the following chart:
Ethyne → trimerization → compound (X) → catalytic hydrogenation → compound (Y)
What is the similarity between compounds (X) and (Y)?

1. A Reacting by addition.
2. B Being aromatic compounds.
3. C The molar mass.
4. D Being cyclic compounds.

What is the number of moles of H₂ needed to convert 3-phenylpropene into a saturated compound?

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

All of the following are true for naphthalene, except ..........

1. A It is an unsaturated hydrocarbon.
2. B Its molar mass is less than the molar mass of biphenyl.
3. C Its molecule contains 10 carbon atoms.
4. D One mole of it reacts with 4 mol of hydrogen to form a saturated compound.

All of the following describe vinylbenzene, except that it ..........

1. A is a hydrocarbon.
2. B is used in condensation polymerization reactions.
3. C can be converted into a saturated compound.
4. D is used as a monomer in addition polymerization reactions.

What is the number of chlorine atoms in one molecule of gammexane?

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

The cyclic haloalkane used as an insecticide is known as ..........

1. A 1,1,1-trichloroethane.
2. B gammexane.
3. C chlorocyclohexane.
4. D halothane.

Which of the following expresses the suitable process (X) for converting compound (Y) into the product (Z)?

1. A (X) hydrolysis , (Y) ethyl hydrogen sulphate , (Z) ethene
2. B (X) hydration , (Y) ethanol , (Z) ethene + water
3. C (X) condensation polymerization , (Y) tetrafluoroethene , (Z) Teflon
4. D (X) addition , (Y) aromatic benzene , (Z) gammexane

Aromatic benzene and toluene share the general formula ..........

1. A CₙH₂ₙ₋₆
2. B CₙHₙ₋₆
3. C CₙH₂ₙ₋₂
4. D CₙH₂ₙ

What is the number of bonds in a toluene molecule?

1. A (σ) : 6 , (π) : 3
2. B (σ) : 9 , (π) : 3
3. C (σ) : 9 , (π) : 6
4. D (σ) : 15 , (π) : 3

(1) : Its benzene ring is bonded to a methyl group.
(2) : Its benzene ring is bonded to another benzene ring.
(3) : Its molecule contains only 3 π bonds.
(4) : Its molecule contains 8 hydrogen atoms.
Which statement(s) express(es) the similarity (similarities) between toluene and naphthalene?

1. A (1) only.
2. B (4) only.
3. C (1) , (2) only.
4. D (3) , (4) only.

Aminobenzene is prepared from benzene in two steps, as in the opposite chart:
What substances are used in step (1) and what type of reaction is step (2)?

1. A Step (1) : conc HNO₂ , conc H₂SO₄ / Step (2) : oxidation
2. B Step (1) : conc HNO₂ , conc H₂SO₄ / Step (2) : reduction
3. C Step (1) : conc HNO₃ , conc H₂SO₄ / Step (2) : oxidation
4. D Step (1) : conc HNO₃ , conc H₂SO₄ / Step (2) : reduction

From the opposite chart:
Which of the following expresses the main products (X) and (Y)?

1. A (X) : benzene , (Y) : bromobenzene
2. B (X) : hexabromocyclohexane , (Y) : hydrogen bromide
3. C (X) : hexabromocyclohexane , (Y) : bromobenzene
4. D (X) : benzene , (Y) : hydrogen bromide

Which of the following equations is an application of the Friedel-Crafts reaction?

1. A C₆H₆ + C₂H₅Cl → C₆H₅C₂H₅ + HCl (AlCl₃ anhydrous)
2. B C₂H₅OH + HCl → C₂H₅Cl + H₂O (ZnCl₂)
3. C C₆H₅Cl + CH₃COCl → C₆H₅COCH₃ + Cl₂ (AlCl₃ anhydrous)
4. D C₂H₅Br + KOH → C₂H₅OH + KBr

When toluene reacts with X₂ in the presence of FeX₃ , .......... is formed.

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

Benzene reacts with ..........

1. A bromine dissolved in CCl₄
2. B nitric acid.
3. C water.
4. D ethanol.

What are the steps for preparing para-toluenesulphonic acid from normal hexane?

1. A trimerization → sulphonation → nitration.
2. B reforming → alkylation → sulphonation.
3. C trimerization → sulphonation → alkylation.
4. D reforming → nitration → sulphonation.

Toluene reacts with chlorine gas in the presence of (X) as a catalyst to form compound (Y).
Which of the following expresses each of (X) and (Y)?

1. A (X) : FeCl₂ , (Y) : chlorotoluene
2. B (X) : Fe , (Y) : meta-chlorotoluene
3. C (X) : FeCl₃ , (Y) : gammexane
4. D (X) : Fe , (Y) : a mixture of ortho- and para-chlorotoluene

Toluene reacts with concentrated HNO₃ in the presence of concentrated H₂SO₄ , forming ..........

1. A para-nitrotoluene.
2. B meta-nitrotoluene.
3. C 2,3-dinitrotoluene.
4. D 4,5-dinitrotoluene.

Benzene can be converted into TNT through two reactions, which are ..........

1. A alkylation, then nitration.
2. B nitration, then alkylation.
3. C alkylation, then addition.
4. D addition, then nitration.

The compound 1-chloro-2-methylbenzene is produced from ..........

1. A reducing phenol, then halogenating the product.
2. B alkylating benzene, then halogenating the product in the presence of iron.
3. C reducing phenol, then alkylating the product.
4. D alkylating toluene, then halogenating the product in the presence of iron.

An aromatic derivative (A) contains more than one (N – O) bond.
Which of the following is incorrect for (A)?

1. A It can be prepared from toluene.
2. B It contains its own fuel.
3. C Nitrogen gas is produced when it burns.
4. D It exists in the gaseous state.

Which of the following expresses a compound, a mixture and a polymer?

1. A compound : bronze , mixture : marsh gas , polymer : Fehling's solution
2. B compound : TNT , mixture : water gas , polymer : PP
3. C compound : Fehling's solution , mixture : marsh gas , polymer : bronze
4. D compound : PP , mixture : water gas , polymer : TNT

The following chart shows the steps for converting benzene into 2-bromo-1-methyl-4-nitrobenzene:
benzene → (1) → (2) → (3) → (4) → (5) → (6)
Which of the following is correct?

1. A (1) : CH₃Cl / AlCl₃ , (3) : HNO₃ / H₂SO₄ , (6) : C₇H₆BrNO₂
2. B (2) : C₆H₅CH₃ , (4) : C₇H₈NO₂ , (5) : HBr / Fe
3. C (1) : CH₃Cl / AlCl₃ , (3) : Br₂ / Fe , (6) : C₇H₈BrNO₃
4. D (2) : C₆H₅NO₂ , (4) : CH₃Cl / AlCl₃ , (5) : C₆H₄BrNO₂

The following chart shows some reactions that take place under suitable conditions:
Which of the following expresses the IUPAC name of each of compounds (X) and (Y)?

1. A (X) : 1-chloro-2-nitrobenzene , (Y) : 1-chloro-4-nitrobenzene.
2. B (X) : meta-chloronitrobenzene , (Y) : 1-chloro-5-nitrobenzene.
3. C (X) : 1-chloro-4-nitrobenzene , (Y) : 1-chloro-3-nitrobenzene.
4. D (X) : 4-nitro-1-chlorobenzene , (Y) : para-chloronitrobenzene.

Sulphuric acid is used in the following industries, except ..........

1. A making one type of car battery.
2. B making food preservatives.
3. C making synthetic detergents.
4. D detecting the barium cation.

The opposite figure shows the structural formula of a compound.
All of the following describe this compound, except ..........

1. A It dissolves in water.
2. B It is a sodium salt.
3. C It has an ionized group.
4. D It is formed by neutralization, then sulphonation.

Explain the mistake in the name of each of the following two compounds, and write the correct name of each according to the IUPAC system:
(1) 1,1-dimethyl-2-phenylethene.
(2) 1,5-dihydroxybenzene.

Draw the structural formula and write the molecular formula of each of:
(1) 1,3-dibromobenzene.
(2) 1-ethyl-3-methylcyclohexane.

Write the IUPAC name of each of the following:

Write the IUPAC name of each of the following:

The opposite figure shows the structural formula of an aromatic compound:
(1) Write the IUPAC name of this compound.
(2) How many moles of H₂ are needed to convert this compound into a cycloalkane?

The opposite figure shows the structural formula of an aromatic compound:
(1) Write the IUPAC name of this compound.
(2) Write the molecular formula of this compound.

Write the IUPAC name of each of the following:

Iron reacts with chlorine gas forming compound (X), while its reaction with the concentrated acid (Y) does not continue because of passivity. Write the balanced symbolic equation for preparing each of:
(1) a blood-red solution from compound (X).
(2) a compound with the chemical formula C₇H₅N₃O₆ using compound (Y).

Compound (X) can be obtained by hydrogenating aromatic benzene:
(1) Why is compound (X) stable?
(2) Compare compound (X) and aromatic benzene in terms of the general formula.

Halothane is prepared from ethane, while gammexane is prepared from aromatic benzene:
(1) State the type of reaction in each case.
(2) Compare halothane and gammexane in terms of the number of chlorine atoms in one molecule.

Halogenating aromatic benzene by substitution forms compound (X), while halogenating it by addition forms compound (Y).
(1) How many moles of halogen are used to form one mole of: (a) compound (X). (b) compound (Y).
(2) Classify each of compounds (X) and (Y) as halogenated hydrocarbon derivatives.

Show by symbolic equations how aromatic benzene is used to prepare ortho- and para-nitrochlorobenzene.

Show by symbolic equations how gammexane is obtained from phenol.

Show by symbolic equations how a straight-chain alkane is converted into a cycloalkane.

TNT and PVC are well-known chemical substances:
(1) Which of these two compounds has a giant molecule? Explain.
(2) Draw the structural formula of each of: (a) TNT (b) PVC

Rearrange the following steps to obtain meta-chloronitrobenzene from calcium carbide:
polymerization. , nitration. , halogenation. , hydrolysis.

If you know that compounds (A) and (B) are hydrocarbons with the following formulas: (Sample exam 2026)
(A) : (CH)₆ , (B) : (CH₂)₆
Which of the following applies to compounds (A) and (B)?

1. A (A) : produced by the catalytic reforming of heptane , (B) : produced by the hydration of hexene.
2. B (A) : its molecular formula is CₙH₂ₙ , (B) : its molecular formula is CₙHₙ
3. C (A) : produced by the reduction of carbolic acid , (B) : produced by the hydrogenation of compound (A).
4. D (A) : an open-chain alkane , (B) : produced by cyclic polymerization.

Two organic compounds (X) and (Y): (Sample exam 2026)
(X) : a hydrocarbon that reacts vigorously with chlorine, and the reaction is accompanied by light and a flame.
(Y) : a halogen derivative of a hydrocarbon used as an insecticide.
Which of the following expresses compound (X) or (Y)?

1. A (X) : an aromatic hydrocarbon that follows the formula CₙH₂ₙ₋₆
2. B (Y) : an aromatic derivative that follows the formula CₙHₙ₋₁Cl
3. C (X) : an aliphatic hydrocarbon that follows the formula CₙH₂ₙ
4. D (Y) : an aliphatic derivative that follows the formula CₙHₙClₙ

The following equation shows one of the catalytic thermal cracking processes: (Sample exam 2026)
C₂₀H₄₂(s) → X(l) + Y(g) + Z(l) (catalyst / pressure / Δ)
(X) : an alkene, one mole of which contains 30 moles of atoms.
(Y) : the heaviest gaseous alkene.
Which of the following does not express compound (Z)?

1. A It is produced by the hydrogenation of hexyne.
2. B It reacts with hydrogen halides (HBr) according to Markovnikov's rule.
3. C Its catalytic reforming gives a compound used as an organic solvent.
4. D It follows the general formula CₙH₂ₙ₊₂

An aromatic liquid (X) whose boiling point is 80°C underwent the opposite reactions: (Sample exam 2026)
X + chlorine (UV) → Y
X + chlorine (UV/FeCl₃) → Z
Which of the following is correct?

1. A (Y) is an aliphatic derivative.
2. B (Y) is an aromatic hydrocarbon.
3. C (Z) is an aromatic hydrocarbon.
4. D (Z) is an aliphatic derivative.

A saturated aliphatic hydrocarbon (X) has the general formula CₙH₂ₙ and contains 6 methylene groups. (Sample exam 2026)
Which of the following expresses the correct order of the processes needed to obtain compound (X) from calcium carbide?

1. A dropping water → trimerization → halogenation.
2. B dropping water → catalytic hydration → oxidation.
3. C dropping water → trimerization → hydrogenation.
4. D thermal decomposition → polymerization → hydrogenation.

Which of the following choices expresses the correct order of the processes needed to obtain an aliphatic insecticide with the formula CₙHₙClₙ from an aliphatic compound with the formula CₙH₂ₙ₊₂? (Sample exam 2026)

1. A catalytic reforming – halogenation in the presence of a catalyst.
2. B trimerization – halogenation in the presence of UV
3. C catalytic reforming – halogenation in the presence of UV
4. D trimerization – halogenation in the presence of a catalyst.

Which of the following choices expresses a compound that does not decolourize bromine dissolved in carbon tetrachloride? (Sample exam 2026)

1. A The product of dropping water on calcium carbide.
2. B The product of the catalytic reforming of hexane.
3. C The product of adding concentrated sulphuric acid to propanol at 180°C
4. D The product of strongly heating then rapidly cooling the product of the dry distillation of sodium acetate.

Which of the following is the compound produced by the catalytic reforming of 3-ethylhexane, then the hydrogenation of the product? (1st session 2025)

1. A Ethylbenzene.
2. B Dimethylbenzene.
3. C Methylcyclohexane.
4. D Ethylcyclohexane.

Which of the following is the last process to obtain the following compound from benzene? (1st session 2025)

1. A Nitration.
2. B Polymerization.
3. C Alkylation.
4. D Halogenation.

The opposite table shows the molecular formulas of three organic compounds X , Y , Z , so .......... (Trial exam / June 2021)
(X) : C₃H₆ , (Y) : C₇H₈ , (Z) : C₃H₈

1. A (X) : cycloalkane , (Z) : normal alkane , (Y) : aromatic.
2. B (X) : normal alkane , (Z) : cycloalkane , (Y) : aromatic.
3. C (X) : alkyne , (Z) : normal alkane , (Y) : aromatic.
4. D (X) : aromatic , (Z) : alkene , (Y) : alkyne.

You have the following four compounds: (1st session 2022)
(A) : C₃H₈ , (B) : C₆H₆ , (C) : C₈H₁₀ , (D) : C₂H₂
Which of the following is correct?

1. A Compound (A) is unsaturated aliphatic, compound (C) is aromatic.
2. B Compound (A) is saturated aliphatic, compound (D) is unsaturated aliphatic.
3. C Compound (B) is aromatic, compound (D) is saturated aliphatic.
4. D Compound (C) is aromatic, compound (B) is saturated aliphatic.

Using the following table: (2nd session 2022)
(A) : C₃H₄ , (B) : C₁₀H₈ , (C) : C₄H₈ , (D) : C₁₀H₂₂
The correct choice that expresses substances (A) , (B) , (C) , (D) is ..........

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

From the following organic compounds: (1st session 2024)
(X) : C₇H₈ , (Y) : C₃H₆ , (Z) : C₆H₁₄
Which of the following choices is correct?

1. A (X) is an alkyne used in the oxyacetylene flame, (Y) is an alkane used to prepare benzene, (Z) is an alkene used to prepare acetaldehyde.
2. B (X) is aromatic and used as an organic solvent, (Y) is an alkene used to make plastic bags, (Z) is an alkane used as a fuel.
3. C (X) is an alkane used as an anaesthetic, (Y) is an alkane used as a fuel, (Z) is aromatic and used as an organic solvent.
4. D (X) is aromatic and used to make explosives, (Y) is an alkene used to make carpets, (Z) is an alkane used to prepare benzene.

Each of the following steps is carried out to convert a compound with the general formula CₙH₂ₙ₊₂ into a compound with the general formula CₙH₂ₙ , except .......... (1st session 2023)

1. A strong heating and rapid cooling – polymerization – hydrogenation.
2. B reforming – alkylation – hydrogenation.
3. C halogenation – alkaline hydrolysis – dehydration.
4. D strong heating and rapid cooling – catalytic hydration – reduction.

The number of moles of hydrogen that must be added to 1 mol of diphenylacetylene to convert it into a saturated compound equals .......... (1st session 2022)

1. A 4 mol
2. B 5 mol
3. C 6 mol
4. D 8 mol

To obtain a cycloalkane from calcium carbide we follow the steps .......... (Trial exam / June 2021)

1. A reaction with water / polymerization / hydrogenation.
2. B hydrogenation / polymerization / reaction with water.
3. C reaction with water / hydrogenation / polymerization.
4. D hydrogenation / reaction with water / polymerization.

Hydrogenating the compound produced by the reduction of phenol under suitable conditions leads to the formation of .......... (1st session 2021)

1. A picric acid.
2. B an aliphatic compound.
3. C vinyl chloride.
4. D an aromatic compound.

The number of moles of hydrogen gas that must be added to 2 mol of phenylacetylene to saturate it equals .......... (Trial exam / March 2023)

1. A 5 mol
2. B 10 mol
3. C 4 mol
4. D 6 mol

From the following chart: (Trial exam / March 2023)
CₙHₙO → (reduction) CₙHₙ → (1) (A) CₙH₂ₙ
Process (1) and compound (A) are ..........

1. A (1) : polymerization , (A) : cyclohexane.
2. B (1) : hydrogenation , (A) : cyclohexane.
3. C (1) : hydrogenation , (A) : hexene.
4. D (1) : polymerization , (A) : hexene.

To obtain an aliphatic compound used as an insecticide from calcium carbide, the steps in order are .......... (2nd session 2022)

1. A dropping water – polymerization – halogenation by addition.
2. B dropping water – hydrogenation – oxidation.
3. C dropping water – hydrogenation – reduction.
4. D dropping water – polymerization – halogenation by substitution.

The correct order of the chemical processes used to convert an alkane made of (5) atoms into an insecticide made of (18) atoms is .......... (Trial exam / March 2023)

1. A strong heating with rapid cooling, then halogenation, then polymerization.
2. B polymerization, then halogenation, then strong heating with rapid cooling.
3. C strong heating with rapid cooling, then polymerization, then halogenation.
4. D halogenation, then strong heating with rapid cooling, then polymerization.

An aromatic compound with the molecular formula C₈H₁₀ can be prepared from .......... (Trial exam / June 2021)

1. A the reaction of ethyl chloride with benzene in the presence of anhydrous aluminium chloride.
2. B the reaction of methyl chloride with benzene in the presence of anhydrous aluminium chloride.
3. C heating heptane in the presence of platinum.
4. D heating hexane in the presence of platinum.

From the following chart: (1st session 2023)
C₃H₆ → (HX) (A) → (C₆H₆ + anhydrous AlCl₃) (B)
(A) and (B) are ..........

1. A (A) : secondary propyl chloride , (B) : 1-phenylpropane.
2. B (A) : primary propyl bromide , (B) : 1-phenylpropane.
3. C (A) : secondary propyl chloride , (B) : 2-phenylpropane.
4. D (A) : primary propyl bromide , (B) : 2-phenylpropane.

When the opposite compound (benzaldehyde) is nitrated, the product is .......... (1st session 2022)

1. A ortho-nitrobenzaldehyde.
2. B para-nitrobenzaldehyde.
3. C meta-nitrobenzaldehyde.
4. D a mixture of ortho- and para-nitrobenzaldehyde.

When the compound produced by the catalytic reforming of normal heptane is nitrated, .......... is formed. (1st session 2021)

1. A an insecticide
2. B a synthetic detergent
3. C an explosive with the molecular formula C₆H₃N₃O₇
4. D an explosive with the molecular formula C₇H₅N₃O₆

After studying the opposite graph, which shows the relation between the number of carbon atoms and the number of hydrogen atoms for some hydrocarbons, (2nd session 2023)
the processes used to obtain compound (D) from compound (A) are ..........

1. A strong heating then rapid cooling – alkylation – polymerization.
2. B strong heating then rapid cooling – polymerization – alkylation.
3. C polymerization – alkylation – strong heating then rapid cooling.
4. D polymerization – strong heating then rapid cooling – alkylation.

From the following chart: (2nd session 2023)
heptane → (reforming) (X) → (hydrogenation) (Y)
Which of the following choices is correct for each of (X) and (Y)?

1. A (X) and (Y) react by addition.
2. B (X) and (Y) react by substitution.
3. C (Y) reacts by addition only.
4. D (X) reacts by substitution only.

From the following reaction: (Sample exam 2026)
C₆H₅CH₂Cl + C₆H₆ → A + B (in the presence of AlCl₃)
Which of the following represents each of compounds (A) and (B)?

1. A (A) : C₆H₅CHClC₆H₅ , (B) : H₂
2. B (A) : C₆H₅CH₂C₆H₄Cl , (B) : H₂
3. C (A) : C₆H₅CH₂C₆H₅ , (B) : HCl
4. D (A) : C₆H₅CH₂C₆H₅ , (B) : Cl₂

When the chemical processes (halogenation - reaction with benzene - nitration) are carried out in order on (a gas found in coal mines), the compound produced is .......... (Sample exam 2026)

1. A the insecticide trinitrobenzene.
2. B the explosive TNT
3. C the explosive picric acid.
4. D the insecticide gammexane.

The following table shows the chemical formulas of organic compounds: (Sample exam 2026)
Write the IUPAC name of each of the following:
(1) The compound produced by the reaction of one mole of one of the above compounds with 2 mol of bromine to give a saturated compound.
(2) The compound produced by the reaction of HBr with one of the above compounds according to Markovnikov's rule in the first step.
(3) The two compounds produced by the reaction of 2 mol of one of the above compounds with 2 mol of chlorine under suitable conditions, giving two isomers, each monochlorinated.