Chemistry Aromatic Hydrocarbons MCQs Chapter 9 Class 12 - PLS Academy

Chemistry Aromatic Hydrocarbons MCQs – Chapter 9 Class 12

Chemistry Aromatic Hydrocarbons is an important chapter of Class 12 Chemistry and plays a key role in FSc Part-II exams and entry test preparation. MCQs from this chapter are frequently included in MDCAT, NUMS, AKU, NUST, UET ECAT, and board examinations. This chapter covers essential topics such as the structure of benzene, aromaticity, resonance, IUPAC nomenclature, physical and chemical properties, and important reactions of aromatic hydrocarbons.

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Created on February 10, 2022 By Ali Durrani

Chemistry Ch 9 Class 12 Hydrocarbons

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1 / 63

Name the main product formed as a result of the following reaction

H3C – (CH2)5 – CH3 ————> Product

n-heptane

Conditions: 480 – 550 C, 150 – 399 psi V2O5

NTS 2019
Chemistry
Hydrocarbons
Elimination Tool:

A) Benzene

B) Toluene

C) Xylene

D) Cyclohexane

2 / 63

Name the main product formed as a result of the following reaction

H3C – (CH2)5 – CH3 ————> Product

n-heptane

Conditions: 480 – 550 C, 150 – 399 psi V2O5

NTS 2019
Chemistry
Hydrocarbons
Elimination Tool:

A) Benzene

B) Toluene

C) Xylene

D) Cyclohexane

3 / 63

PolymerizatIon of ______ produces synthetic rubber.

PMC Sample 1
Chemistry
Hydrocarbons
Elimination Tool:

A) Formaldehyde

B) Choloropropene

C) Chloroform

D) Vinyl bromide

4 / 63

Which of the following is NOT explained by Kekule structure of benzene?

PMC Sample 2
Chemistry
Hydrocarbons
Elimination Tool:

A) Hexagonal planar structure

B) The usual saturated behaviour of benzene

C) Unsaturation

D) Presence of three double bonds

5 / 63

The structure of cyclohexane is:

PMC Sample 3
Chemistry
Hydrocarbons
Elimination Tool:

A) Trigonal

B) Pentagonal

C) Hexagonal

D) None of these options is correct

6 / 63

Benzene with nitrating mixture gives?

Nitro benzene

Nitro Toluene

Nitro methane

Acrylonitrile

7 / 63

Hydrocarbons which burn with a smoky flame are called:

NUMS 2015
Chemistry
Hydrocarbons
Elimination Tool:

A) Aliphatic

B) Aromatic

C) Alicyclic

D) None of these

8 / 63

All of the following react with KMnO4 except

NUMS 2017
Chemistry
Hydrocarbons
Elimination Tool:

A) Ethane

B) Ethyne

C) Ethylbenzene

D) Ethene

9 / 63

n-Heptane can be converted into benzene by catalysts:

Al203, Si02, Fe203

Si02, K20, Cr203

Al203,Si02, Cr203

None of these

10 / 63

Alkenes are:

PMC Sample 3
Chemistry
Hydrocarbons
Elimination Tool:

A) Electrophiles

B) Nucleophiles

C) Both Options are correct

D) None of these options is correct

11 / 63

The C-H bond distance is the longest in:

NUMS 2015
Chemistry
Hydrocarbons
Elimination Tool:

A) C2H4

B) C2H2

C) C2H6

D) C2H2Br

12 / 63

Acetylene upon heating at 300 C gives:

Benzene

Alkene

Alkane

Alcohol

13 / 63

How many chain isomers are possible for the alkane C6H14?

NTS 2016 SMBBMC
Chemistry
Hydrocarbons
Elimination Tool:

A) six

B) five

C) four

D) nine

14 / 63

Free radical reactions take place in the presence of ______?

PMC Practice 1
Chemistry
Hydrocarbons
Elimination Tool:

A) Heat

B) Sunlight

C) Catalyst

D) Oxygen

15 / 63

The reaction of benzene with bromine gives?

Allkyl bromide

Hydrogen bromide

Bromo-phenol

Bromo cyclohexane

16 / 63

Alkaline KMnO4 converts ethylene into:

NUMS 2014
Chemistry
Hydrocarbons
Elimination Tool:

A) Methanol

B) Ethane

C) Ethanol

D) Ethylene glycol

17 / 63

Stability of benzene is due to

Alternate double bonds

Electrons' cloud

Double bonds

Delocalization of electrons

18 / 63

Fuels with higher octane number can be produced by ___________.

PMC Practice 2
Chemistry
Hydrocarbons
Elimination Tool:

A) Cracking

B) Reforming

C) Decomposition

D) Isomerisation

19 / 63

Benzene when reacted with chlorine in ultraviolet rays produces:

Hexacholorocyclohexane

P-dichlorobenzene

Benzotrichloride

Benzalchloride

20 / 63

Which of the following compounds will form a hydrocarbon on reaction with Grignard reagent?

NUMS 2014
Chemistry
Hydrocarbons
Elimination Tool:

A) CH3CH2OH

B) CH3COOCH3

C) CH3COCH3

D) CH3CHO

21 / 63

The four bonds of carbon in methane are directed towards the corners of a:

NUMS 2014
Chemistry
Hydrocarbons
Elimination Tool:

A) Cube

B) Pentagon

C) Hexagon

D) Tetrahedron

22 / 63

Activation of the benzene ring in aniline can be decreased by treating with:

NUMS 2017
Chemistry
Hydrocarbons
Elimination Tool:

A) Dil HCL

B) Ethyl alcohol

C) Acetic acid

D) Acetyl chloride

23 / 63

The bond angles in benzene ring are:

PMC Sample 1
Chemistry
Hydrocarbons
Elimination Tool:

A) 90˚

B) 60˚

C) 120˚

D) 180˚

24 / 63

Catalytic hydrogenation of alkenes exhibits:

NUMS 2019 Cancelled
Chemistry
Hydrocarbons
Elimination Tool:

A) Substitution reaction

B) Elimination reaction

C) Addition reaction

D) Condensation reaction

25 / 63

The carbon number of gasoline is:

NTS 2019
Chemistry
Hydrocarbons
Elimination Tool:

A) C5 – C6

B) C6 – C7

C) C5 – C10

D) C12 – C15

26 / 63

The hybridization of benzene is:

sp3

sp2

None of these

27 / 63

In composition of natural gas, 0.17% is constituted by:

NUMS 2018
Chemistry
Hydrocarbons
Elimination Tool:

A) Methane

B) Ethane

C) Butane

D) Nitrogen

28 / 63

Physical properties of Ethyne is/are:

NTS 2015 DUHS and JSMU
Chemistry
Hydrocarbons
Elimination Tool:

A) It is colourless gas with a sweet smell.

B) It is sparingly soluble in water.

C) It is less dense than air.

D) It explodes on compression to a liquid because of unstable nature.

E) All of the above

29 / 63

Organic compounds in which tetravalency of carbon atom is satisfied are called as ____ ?

PMC Practice 1
Chemistry
Hydrocarbons
Elimination Tool:

A) Saturated

B) Unsaturated

C) Alkenes

D) Alkynes

30 / 63

Which catalyst is used to oxidize benzene rings?

NUMS 2019 Reconduct
Chemistry
Hydrocarbons
Elimination Tool:

A) FeBr3

B) V2O5

C) Fe + Al2O3

D) Raney Ni

31 / 63

What happens when one mole of ethane is mixed in the dark at room temperature with six moles of chlorine?

NTS 2017
Chemistry
Hydrocarbons
Elimination Tool:

A) There is no reaction.

B) CH3CH2Cl and HCl are formed.

C) CH3CCl3 and HCl are formed.

D) CCl3CCl3 and HCl are formed.

32 / 63

What are the products of destructive distillation of coal?

PMC Practice 1
Chemistry
Hydrocarbons
Elimination Tool:

A) Coal tar

B) Coke

C) Coal gas

D) All of above

33 / 63

Acetylene polymerizes to make:

PMC Sample 3
Chemistry
Hydrocarbons
Elimination Tool:

A) Cyclohexane

B) Benzene

C) Hexane

D) Toluene

34 / 63

How many chain isomers of Pentane is possible?

PMC Practice 1
Chemistry
Hydrocarbons
Elimination Tool:

A) Two

B) Four

C) Three

D) Five

35 / 63

Reduction of benzene is presence of Ni gives:

NUMS 2019 Cancelled
Chemistry
Hydrocarbons
Elimination Tool:

A) Cyclohexane

B) Heterocyclic

C) Alicyclic

D) Unsaturated aliphatic

36 / 63

Which of the following method is used to prepare Ethylene glycol from ethene?

PMC Practice 1
Chemistry
Hydrocarbons
Elimination Tool:

A) Dehydration

B) Hydroxylation

C) Hydration

D) Luca's test

37 / 63

C6H5 Is:

Phenyl

Methyl

Ethyl

Hexyl

38 / 63

Which one of the following is not a heterocyclic compound?

PMC Sample 3
Chemistry
Hydrocarbons
Elimination Tool:

A) Thiophene

B) Anthracene

C) Furan

D) Pyrrole

39 / 63

Friedel craft’s reaction gives?

Benzene

Nitrobenzene

Toluene

Alkene

40 / 63

Which type of bonds are broken during cracking?

PMC Practice 1
Chemistry
Hydrocarbons
Elimination Tool:

A) C- C

B) C-H

C) Both C-C and C-H

D) C-0

41 / 63

Which of the following statements is incorrect about benzene?

All of the carbon atoms are sp hybridized.

The carbon-carbon bond lengths are all the same.

It has delocalized electrons.

The carbon-hydrogen bond lengths are all the same.

42 / 63

Who rejected vital force theory

PMC Sample 3
Chemistry
Hydrocarbons
Elimination Tool:

A) Wohler

B) Berzelius

C) Wallus

D) Lyll

43 / 63

The unhybridized p orbitals of benzene are present in the form of _________.

PMC Practice 2
Chemistry
Hydrocarbons
Elimination Tool:

A) Between the C-C bonds of benzene

B) Above and below the carbon bonds

C) In the form of a cloud above and below the benzene ring

D) None of these options is correct

44 / 63

Which type of hybridization takes place in benzene?

Sp3

Sp2

Sp2 and Sp3

45 / 63

Benzene is prepared in laboratory by distillation of phenol with

H202

Zn dust

Ethyl bromide

HOCI

46 / 63

How many Dewar Structure of Benzene are present?

Infinite

47 / 63

Which derivative of benzene shows maximum reactivity in electrophilic substitution reactions?

UHS 2019
Chemistry
Hydrocarbons
Elimination Tool:

A) Benzoic acid

B) Methyl benzene

C) Benzaldehyde

D) Nitrobenzene

48 / 63

The ratio of σ to π bonds in benzene is:

NUMS 2019 Reconduct
Chemistry
Hydrocarbons
Elimination Tool:

A) 4:1

B) 1:4

C) 1:3

D) 3:1

49 / 63

Alkenes undergo:

UHS 2019
Chemistry
Hydrocarbons
Elimination Tool:

A) Electrophilic Addition

B) Electrophilic substitution

C) Nucleophilic substitution

D) Nucleophilic addition

50 / 63

Gasoline is a mixture of?

NUMS 2018
Chemistry
Hydrocarbons
Elimination Tool:

A) C3 – C5 alkanes

B) C15 – C20 alkanes

C) C11 – C15 alkanes

D) C7 – C9 alkanes

51 / 63

Which one of the following is the correct structure of 2,2-Dimethylbutane?

PMC Sample 1
Chemistry
Hydrocarbons
Elimination Tool:

A) CH₃(CH₃)₂CCH₂CH₃

B) CH₃(CH₃)CCHCH₃

C) CH₃(CH₃)CCH₂CH₃

D) CH₃CH₂CH₂CH₃

52 / 63

Which of the following gases is used for welding purpose:

NTS 2019
Chemistry
Hydrocarbons
Elimination Tool:

A) ethene

B) ethane

C) propane

D) ethyne

53 / 63

Acetylene on reacting with ammonium silver nitrate gives.

NUMS 2014
Chemistry
Hydrocarbons
Elimination Tool:

A) Silver metal

B) Silver mirror

C) Silver acetylide

D) Silver acetate

54 / 63

If both double and triple bonds are present in the chain, double bond is given the ______

PMC Sample 2
Chemistry
Hydrocarbons
Elimination Tool:

A) Higher number

B) Lower Number

C) Priority

D) Second position

55 / 63

Which one of the following organic compounds have the least carbon-carbon bond length?

NUMS 2017
Chemistry
Hydrocarbons
Elimination Tool:

A) Ethene

B) Ethane

C) Ethyne

D) Methane

56 / 63

What is the color of silver acetylide, AgC=CAg?

PMC Practice 2
Chemistry
Hydrocarbons
Elimination Tool:

A) Red

B) White

C) Brown

D) Pinkish

57 / 63

In which of the following cases are the benzene rings isolated?

NUMS 2015
Chemistry
Hydrocarbons
Elimination Tool:

A) Naphthalene

B) Phenanthrene

C) Anthracene

D) Triphenylmethane

58 / 63

Which of the following Is formula of Benzyl Alcohol?

C6H5CHO

C6H5CH202CC6H5

C6H5CH2OH

C5H5N

59 / 63

Friedel-Crafts Reaction can be used for the preparation of :

Toluene

Benzene

Phenol

pABA

60 / 63

Boiling point of benzene is:

70.3

80.1

133

79.41

61 / 63

Methane gas is also known as

PMC Sample 2
Chemistry
Hydrocarbons
Elimination Tool:

A) Marsh gas

B) Pepper gas

C) Mustard gas

D) None of the above

62 / 63

Which of the following compounds react slower than benzene in electrophilic substitution reaction?

NUMS 2019 Reconduct
Chemistry
Hydrocarbons
Elimination Tool:

A) Nitrobenzene

B) Phenol

C) Aniline

D) Toluene

63 / 63

The position of the double bond in alkenes can be identified by:

PMC Sample 3
Chemistry
Hydrocarbons
Elimination Tool:

A) Bromine water

B) Ozonolysis

C) Baeyer's reagent

D) Wurtz synthesis

Your score is

The average score is 70%

Importance of Aromatic Hydrocarbons MCQs

A strong understanding of aromatic hydrocarbons helps students predict reactions, identify compounds, and solve conceptual and numerical problems. Exams often include MCQs on electrophilic substitution reactions, resonance stability, and comparative properties of aromatic compounds. Practicing chapter-wise MCQs improves conceptual clarity, accuracy, and confidence for competitive exams.

Effective Strategy for Free Preparation

For effective preparation, students should revise nomenclature rules, reaction mechanisms, and properties of aromatic compounds regularly, and solve topic-wise MCQs consistently. Attempting free tests and past paper questions helps identify important concepts and repeated exam patterns. PLS Academy provides structured MCQs and free resources to support Chemistry Aromatic Hydrocarbons preparation and other Class 12 Chemistry chapters.

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