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Haloalkanes and Haloarenes WBJEE MCQ & Practice Questions

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Haloalkanes and Haloarenes Revision Guide for WBJEE Chemistry

Haloalkanes and Haloarenes 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

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  • Important equations or relationships
  • Common applications and examples
  • Frequently confused concepts
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  • Error review and targeted revision

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Top 20 Haloalkanes and Haloarenes MCQs with Answers

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WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

1. Which fundamental condition must be respected in solving Haloalkanes and Haloarenes problems?

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

WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

2. At dynamic equilibrium relevant to Haloalkanes and Haloarenes:

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

WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

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

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

WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

4. A catalyst in Haloalkanes and Haloarenes generally:

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

WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

5. Oxidation means:

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

WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

6. Reduction means:

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

WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

7. A Lewis acid is:

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

WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

8. A Lewis base is:

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

WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

9. Which is a state function?

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

WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

10. The correct relation is:

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

WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

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

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

WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

12. Arrhenius equation is:

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

WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

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

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

WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

14. For a weak acid, larger Ka means:

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

WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

15. At 25°C:

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

WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

16. Oxidation in an electrochemical cell occurs at:

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

WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

17. Reduction in an electrochemical cell occurs at:

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

WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

18. Positive E°cell implies:

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

WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

19. Higher bond order generally gives:

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

WBJEE Chemistry · Haloalkanes and Haloarenes · Very Very Hard

20. A nucleophile is:

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

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Haloalkanes and Haloarenes Frequently Asked Questions

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