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Aromatic Hydrocarbons — WBJEE MCQs & Practice

Sharpen WBJEE chemistry on aromatic hydrocarbons with topicwise MCQs, answers, clear explanations, quick revision notes and related ChemNexa mock tests.

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Aromatic Hydrocarbons Revision Guide for WBJEE Chemistry

Aromatic Hydrocarbons is part of WBJEE Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

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Important Topics

  • Core definitions and principles
  • Important equations or relationships
  • Common applications and examples
  • Frequently confused concepts
  • Exam-style multiple-choice questions
  • Error review and targeted revision

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What to practise in Aromatic Hydrocarbons

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Top 20 Aromatic Hydrocarbons MCQs with Answers

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WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

1. Benzene contains how many delocalised pi electrons?

  • A. 8
  • B. 2
  • C. 6
  • D. 4
Answer: C
Explanation: Benzene has six π electrons delocalised over its six-carbon ring.

WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

2. According to Hückel's rule, a planar cyclic conjugated system is aromatic when it contains:

  • A. No pi electrons
  • B. (4n+2) pi electrons
  • C. 4n pi electrons
  • D. 2n pi electrons
Answer: B
Explanation: Hückel aromaticity requires 4n+2 π electrons.

WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

3. Each carbon atom in benzene is:

  • A. sp2 hybridised
  • B. sp3 hybridised
  • C. sp hybridised
  • D. dsp2 hybridised
Answer: A
Explanation: Each benzene carbon is trigonal planar and sp2 hybridised.

WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

4. All carbon-carbon bonds in benzene have:

  • A. Alternating fixed single and double bond lengths
  • B. Triple-bond lengths
  • C. Ionic character only
  • D. Equal lengths
Answer: D
Explanation: π-electron delocalisation makes all six C-C bonds equivalent.

WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

5. The exceptional stability of benzene is primarily due to:

  • A. Ionic bonding
  • B. Hydrogen bonding
  • C. Aromatic delocalisation
  • D. Angle strain
Answer: C
Explanation: Delocalisation of the aromatic π sextet lowers benzene's energy.

WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

6. Benzene preferentially undergoes:

  • A. Radical polymerisation
  • B. Electrophilic substitution
  • C. Electrophilic addition
  • D. Nucleophilic addition
Answer: B
Explanation: Substitution preserves the aromatic π system.

WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

7. The electrophile in nitration of benzene is:

  • A. NO2+
  • B. NO3-
  • C. NH2+
  • D. OH-
Answer: A
Explanation: The nitronium ion is the active electrophile.

WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

8. The nitrating mixture for benzene commonly contains:

  • A. HCl and NaOH
  • B. H2 and Ni
  • C. Br2 and water
  • D. Concentrated HNO3 and concentrated H2SO4
Answer: D
Explanation: Sulfuric acid generates NO2+ from nitric acid.

WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

9. Sulfonation of benzene commonly uses:

  • A. H2/Ni
  • B. NH3
  • C. Fuming sulfuric acid/SO3
  • D. NaOH only
Answer: C
Explanation: SO3 or its protonated form acts as the electrophile.

WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

10. Bromination of benzene generally requires:

  • A. NaBr only
  • B. Br2 with FeBr3
  • C. Br2 water only without catalyst
  • D. HBr and peroxide
Answer: B
Explanation: FeBr3 activates Br2 to generate a strong electrophile.

WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

11. Chlorination of benzene commonly uses:

  • A. Cl2/FeCl3
  • B. HCl only
  • C. NaCl/water
  • D. Cl2 under radical conditions exclusively
Answer: A
Explanation: FeCl3 acts as a Lewis-acid catalyst.

WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

12. Friedel-Crafts alkylation commonly uses an alkyl halide with:

  • A. NaOH
  • B. H2O2
  • C. KMnO4
  • D. Anhydrous AlCl3
Answer: D
Explanation: AlCl3 generates/activates the alkyl electrophile.

WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

13. Friedel-Crafts acylation introduces a:

  • A. Nitro group
  • B. Amino group
  • C. Acyl group
  • D. Hydroxyl group
Answer: C
Explanation: An acylium electrophile substitutes on the aromatic ring.

WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

14. The electrophile in Friedel-Crafts acylation is commonly:

  • A. Hydride ion
  • B. Acylium ion
  • C. Hydroxide ion
  • D. Amide ion
Answer: B
Explanation: RCO+ is resonance stabilised and attacks the aromatic ring.

WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

15. Alkyl groups on benzene are generally:

  • A. Ortho/para directing and activating
  • B. Meta directing and deactivating
  • C. Meta directing and activating
  • D. Ortho directing and strongly deactivating
Answer: A
Explanation: Alkyl groups donate electron density by +I effect/hyperconjugation.

WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

16. The -NO2 group is:

  • A. Ortho/para directing and activating
  • B. Meta directing and activating
  • C. Neutral
  • D. Meta directing and strongly deactivating
Answer: D
Explanation: Nitro withdraws electron density by -I and -M effects.

WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

17. The -OH group on benzene is generally:

  • A. Meta directing and activating
  • B. Non-directing
  • C. Ortho/para directing and activating
  • D. Meta directing and deactivating
Answer: C
Explanation: OH donates a lone pair by resonance.

WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

18. The -NH2 group on benzene is generally:

  • A. Non-directing
  • B. Ortho/para directing and activating
  • C. Meta directing and deactivating
  • D. Meta directing and activating
Answer: B
Explanation: NH2 strongly donates electron density by resonance.

WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

19. Halogens on benzene are unusual because they are:

  • A. Deactivating but ortho/para directing
  • B. Activating and meta directing
  • C. Activating and ortho/para directing
  • D. Deactivating and meta directing
Answer: A
Explanation: Their -I effect deactivates, while lone-pair resonance directs o/p.

WBJEE Chemistry · Aromatic Hydrocarbons · Very Very Hard

20. The -COOH group is generally:

  • A. Ortho/para directing and activating
  • B. Ortho/para directing and deactivating
  • C. Meta directing and activating
  • D. Meta directing and deactivating
Answer: D
Explanation: The carboxyl group withdraws electron density by resonance and induction.

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