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Haloalkanes and Haloarenes CBSE Class 12 MCQ & Practice Questions

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Haloalkanes and Haloarenes Revision Guide for CBSE Class 12 Chemistry

Haloalkanes and Haloarenes is part of CBSE Class 12 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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Top 20 Haloalkanes and Haloarenes MCQs with Answers

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CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

1. General formula of monohaloalkanes is:

  • A. CnH2nX
  • B. CnH2n+1X
  • C. CnH2n-1X
  • D. CnH2n+2X
Answer: B
Explanation: Haloalkanes are alkyl halides.

CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

2. IUPAC name of CH3CH2Cl:

  • A. Chloroethane
  • B. Ethyl chloride
  • C. 1-Chloroethene
  • D. Chloromethane
Answer: A
Explanation: Preferred IUPAC name.

CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

3. SN1 reactions proceed via:

  • A. Free radical
  • B. Carbocation
  • C. Carbanion
  • D. Concerted ion
Answer: B
Explanation: SN1 forms carbocation intermediate.

CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

4. SN2 reactions are:

  • A. Two-step
  • B. One-step concerted
  • C. Radical
  • D. Photochemical
Answer: B
Explanation: Backside attack in one step.

CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

5. SN2 causes:

  • A. Retention
  • B. Racemization
  • C. Inversion
  • D. No stereochemical change
Answer: C
Explanation: Walden inversion.

CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

6. Tertiary haloalkanes favor:

  • A. SN2
  • B. SN1
  • C. Neither
  • D. Addition
Answer: B
Explanation: Stable carbocations.

CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

7. Primary haloalkanes favor:

  • A. SN1
  • B. SN2
  • C. E1
  • D. None
Answer: B
Explanation: Less steric hindrance.

CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

8. Best leaving group:

  • A. F
  • B. Cl
  • C. Br
  • D. I
Answer: D
Explanation: Iodide leaves most easily.

CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

9. Reagent for Wurtz reaction:

  • A. Na/dry ether
  • B. Zn/HCl
  • C. KMnO4
  • D. H2/Ni
Answer: A
Explanation: Couples alkyl halides.

CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

10. Grignard reagent formula:

  • A. RMgX
  • B. RLi
  • C. RX
  • D. RNa2
Answer: A
Explanation: Organomagnesium halide.

CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

11. Grignard reagents react vigorously with:

  • A. Dry ether
  • B. Water
  • C. Benzene
  • D. Hexane
Answer: B
Explanation: Destroyed by protic solvents.

CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

12. Chlorobenzene undergoes SN1 readily:

  • A. True
  • B. False
  • C. Only hot
  • D. Only UV
Answer: B
Explanation: Aryl halides resist SN1.

CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

13. C-Cl bond in chlorobenzene is:

  • A. Pure single
  • B. Partial double
  • C. Ionic
  • D. Hydrogen
Answer: B
Explanation: Resonance strengthens bond.

CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

14. DDT is a:

  • A. Fertilizer
  • B. Insecticide
  • C. Herbicide
  • D. Fungicide
Answer: B
Explanation: Persistent insecticide.

CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

15. BHC stands for:

  • A. Benzene hexachloride
  • B. Bromohexane
  • C. Benzoic acid
  • D. Benzyl chloride
Answer: A
Explanation: Lindane is γ-isomer.

CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

16. Elimination of HX gives:

  • A. Alkane
  • B. Alkene
  • C. Alcohol
  • D. Ether
Answer: B
Explanation: β-elimination.

CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

17. Alcohol to alkyl chloride uses:

  • A. SOCl2
  • B. NaOH
  • C. H2SO4
  • D. KMnO4
Answer: A
Explanation: Thionyl chloride.

CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

18. Finkelstein reaction exchanges:

  • A. Cl for F
  • B. Cl/Br for I
  • C. I for F
  • D. Br for F
Answer: B
Explanation: NaI in acetone.

CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

19. Swarts reaction prepares:

  • A. Alkyl fluorides
  • B. Alkyl iodides
  • C. Alcohols
  • D. Aldehydes
Answer: A
Explanation: Metal fluorides replace halogen.

CBSE Class 12 Chemistry · Haloalkanes and Haloarenes · Very Very Hard

20. Vinyl halides are:

  • A. More reactive SN1
  • B. Less reactive substitution
  • C. Same as alkyl
  • D. Only elimination
Answer: B
Explanation: sp2 C-X bond stronger.

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Haloalkanes and Haloarenes Frequently Asked Questions

How should I prepare Haloalkanes and Haloarenes for CBSE Class 12 Chemistry?

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