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Aromatic Electrophilic Substitution — WBJEE

WBJEE Chemistry practice for aromatic electrophilic substitution: MCQs with answers, clear explanations, chapter revision notes and related mock tests on ChemNexa.

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Aromatic Hydrocarbons and Electrophilic Substitution Revision Guide for WBJEE Chemistry

Aromatic Hydrocarbons and Electrophilic Substitution 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.

Use the sample MCQs on this page to check understanding, then attempt the related ChemNexa tests for broader practice. When an answer is wrong, review the explanation and return to the underlying concept before attempting another set.

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 and Electrophilic Substitution

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Top 20 Aromatic Hydrocarbons and Electrophilic Substitution MCQs with Answers

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WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

1. Which fundamental condition must be respected in solving Aromatic Hydrocarbons and Electrophilic Substitution problems?

  • A. Assume coefficients are one
  • B. Ignore limiting conditions
  • C. Conservation of atoms and charge
  • D. Ignore units
Answer: C
Explanation: Atom and charge conservation are fundamental.

WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

2. At dynamic equilibrium relevant to Aromatic Hydrocarbons and Electrophilic Substitution:

  • A. Catalyst is consumed
  • B. Forward and reverse rates are equal
  • C. All molecular motion stops
  • D. Concentrations must be equal
Answer: B
Explanation: At equilibrium forward and reverse rates are equal.

WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

3. At constant T and P a spontaneous process has:

  • A. ΔG<0
  • B. ΔG>0
  • C. ΔG=0 always
  • D. ΔH=0
Answer: A
Explanation: Spontaneity requires ΔG<0.

WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

4. A catalyst in Aromatic Hydrocarbons and Electrophilic Substitution generally:

  • A. Changes ΔG°
  • B. Changes ΔH
  • C. Changes K at fixed T
  • D. Lowers activation energy without changing K at fixed T
Answer: D
Explanation: Catalysts affect kinetics, not equilibrium thermodynamics.

WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

5. Oxidation means:

  • A. No oxidation-number change
  • B. Gain of protons
  • C. Loss of electrons
  • D. Gain of electrons
Answer: C
Explanation: Oxidation is electron loss.

WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

6. Reduction means:

  • A. Loss of protons
  • B. Gain of electrons
  • C. Loss of electrons
  • D. Increase in oxidation number
Answer: B
Explanation: Reduction is electron gain.

WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

7. A Lewis acid is:

  • A. Electron-pair acceptor
  • B. Electron-pair donor
  • C. Always proton donor
  • D. Always anion
Answer: A
Explanation: Lewis acids accept electron pairs.

WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

8. A Lewis base is:

  • A. Electron-pair acceptor
  • B. Always cation
  • C. Always oxidant
  • D. Electron-pair donor
Answer: D
Explanation: Lewis bases donate electron pairs.

WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

9. Which is a state function?

  • A. Work
  • B. Path length
  • C. Enthalpy
  • D. Heat
Answer: C
Explanation: Enthalpy is a state function.

WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

10. The correct relation is:

  • A. ΔG°=RT/K
  • B. ΔG°=-RT lnK
  • C. ΔG°=RT lnK
  • D. ΔG°=-KRT
Answer: B
Explanation: ΔG°=-RTlnK.

WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

11. For a first-order process, half-life is:

  • A. 0.693/k
  • B. k/0.693
  • C. 1/(k[A]0)
  • D. [A]0/(2k)
Answer: A
Explanation: t1/2=0.693/k.

WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

12. Arrhenius equation is:

  • A. k=Ae^(Ea/RT)
  • B. k=EaRT
  • C. k=A/RT
  • D. k=Ae^(-Ea/RT)
Answer: D
Explanation: Arrhenius equation relates k, Ea and T.

WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

13. 0.20 mol solute in 0.50 L solution has molarity:

  • A. 2.50 M
  • B. 0.70 M
  • C. 0.40 M
  • D. 0.10 M
Answer: C
Explanation: M=0.20/0.50=0.40 M.

WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

14. For a weak acid, larger Ka means:

  • A. Stronger conjugate acid
  • B. Stronger acid
  • C. Weaker acid
  • D. No ionisation
Answer: B
Explanation: Larger Ka means greater ionisation.

WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

15. At 25°C:

  • A. pH+pOH=14
  • B. pH+pOH=7
  • C. pH=pOH always
  • D. pH+pOH=1
Answer: A
Explanation: pH+pOH=pKw=14.

WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

16. Oxidation in an electrochemical cell occurs at:

  • A. Cathode
  • B. Salt bridge
  • C. Wire
  • D. Anode
Answer: D
Explanation: Oxidation occurs at the anode.

WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

17. Reduction in an electrochemical cell occurs at:

  • A. Salt bridge
  • B. Wire
  • C. Cathode
  • D. Anode
Answer: C
Explanation: Reduction occurs at the cathode.

WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

18. Positive E°cell implies:

  • A. No spontaneous reaction
  • B. ΔG°<0
  • C. ΔG°>0
  • D. K<1 necessarily
Answer: B
Explanation: ΔG°=-nFE°.

WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

19. Higher bond order generally gives:

  • A. Shorter stronger bond
  • B. Longer weaker bond
  • C. Longer stronger bond
  • D. No effect
Answer: A
Explanation: Higher bond order strengthens and shortens bonds.

WBJEE Chemistry · Aromatic Hydrocarbons and Electrophilic Substitution · Very Very Hard

20. A nucleophile is:

  • A. Electron-pair acceptor
  • B. Always positive
  • C. Always radical
  • D. Electron-pair donor
Answer: D
Explanation: Nucleophiles donate electron pairs.

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Aromatic Hydrocarbons and Electrophilic Substitution Practice Tests

Aromatic Hydrocarbons and Electrophilic Substitution Frequently Asked Questions

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