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Haloalkanes and Haloarenes JENPAS MCQ & Practice Questions

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Top 20 Haloalkanes and Haloarenes MCQs with Answers

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JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

1. Which substrate undergoes SN1 reaction most readily?

  • A. Methyl chloride
  • B. Vinyl chloride
  • C. tert-Butyl chloride
  • D. Ethyl chloride
Answer: C
Explanation: Tertiary carbocations are most stabilized, favouring SN1.

JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

2. Which substrate undergoes SN2 reaction most readily?

  • A. tert-Butyl chloride
  • B. Methyl iodide
  • C. tert-Butyl iodide
  • D. Neopentyl bromide
Answer: B
Explanation: Minimal steric hindrance makes methyl halides fastest in SN2.

JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

3. The rate of an SN1 reaction depends on:

  • A. Concentration of substrate only
  • B. Concentration of nucleophile only
  • C. Both substrate and nucleophile
  • D. Neither
Answer: A
Explanation: Ionisation of substrate is the rate-determining step.

JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

4. The rate of an SN2 reaction depends on:

  • A. Substrate only
  • B. Nucleophile only
  • C. Solvent only
  • D. Both substrate and nucleophile
Answer: D
Explanation: SN2 is bimolecular in its rate-determining concerted step.

JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

5. SN2 substitution at a chiral carbon normally gives:

  • A. Racemisation only
  • B. No stereochemical change
  • C. Inversion of configuration
  • D. Complete retention
Answer: C
Explanation: Backside attack produces Walden inversion.

JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

6. SN1 substitution at a chiral centre commonly tends toward:

  • A. No product
  • B. Racemisation
  • C. Only inversion
  • D. Only retention
Answer: B
Explanation: A planar carbocation intermediate permits attack from either face.

JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

7. Aryl halides are less reactive toward nucleophilic substitution mainly because:

  • A. C-X bond has partial double-bond character
  • B. Carbon is sp3 hybridised
  • C. C-X bond is unusually long
  • D. Halogen has no lone pairs
Answer: A
Explanation: Resonance gives the aryl C-X bond partial double-bond character.

JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

8. Chlorobenzene on heating with NaOH at high temperature and pressure gives:

  • A. Benzyl alcohol
  • B. Cyclohexanol
  • C. Aniline
  • D. Phenol
Answer: D
Explanation: Dow-type nucleophilic substitution converts chlorobenzene to phenol.

JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

9. Wurtz reaction couples alkyl halides using:

  • A. Mg in water
  • B. KOH(aq)
  • C. Sodium in dry ether
  • D. Zn/HCl
Answer: C
Explanation: Sodium couples alkyl halides in dry ether.

JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

10. Fittig reaction primarily couples:

  • A. Carboxylic acids
  • B. Aryl halides
  • C. Alcohols
  • D. Ketones
Answer: B
Explanation: Aryl halides couple with sodium in dry ether.

JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

11. Wurtz-Fittig reaction produces mainly:

  • A. Alkylbenzene
  • B. Alkene only
  • C. Alcohol
  • D. Aldehyde
Answer: A
Explanation: An aryl halide and alkyl halide couple with sodium.

JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

12. An alkyl halide with alcoholic KOH preferentially undergoes:

  • A. Hydrolysis
  • B. Reduction
  • C. Polymerisation
  • D. Beta-elimination
Answer: D
Explanation: Alcoholic KOH favours dehydrohalogenation.

JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

13. An alkyl halide with aqueous KOH generally gives:

  • A. Alkyne
  • B. Ether only
  • C. Alcohol
  • D. Alkene
Answer: C
Explanation: Hydroxide acts mainly as nucleophile in aqueous medium.

JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

14. According to Saytzeff's rule, dehydrohalogenation usually favours:

  • A. Alcohol
  • B. More substituted alkene
  • C. Least substituted alkene
  • D. Alkyne
Answer: B
Explanation: The more substituted alkene is usually thermodynamically more stable.

JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

15. Grignard reagents have the general formula:

  • A. RMgX
  • B. RX2
  • C. R2MgX
  • D. RNaX
Answer: A
Explanation: Organomagnesium halides are represented as RMgX.

JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

16. Grignard reagents must be prepared under:

  • A. Strongly aqueous conditions
  • B. Concentrated acid
  • C. Steam
  • D. Anhydrous conditions
Answer: D
Explanation: Water protonates and destroys RMgX.

JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

17. Reaction of RMgX with CO2 followed by hydrolysis gives:

  • A. Alkane only
  • B. Ether
  • C. Carboxylic acid
  • D. Alcohol only
Answer: C
Explanation: Carboxylation adds one carbon and hydrolysis yields RCOOH.

JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

18. Reaction of a Grignard reagent with formaldehyde followed by hydrolysis gives:

  • A. Ketone
  • B. Primary alcohol
  • C. Secondary alcohol
  • D. Tertiary alcohol
Answer: B
Explanation: Formaldehyde gives a primary alcohol after nucleophilic addition.

JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

19. Reaction of RMgX with an aldehyde other than formaldehyde followed by hydrolysis gives:

  • A. Secondary alcohol
  • B. Primary alcohol
  • C. Tertiary alcohol
  • D. Carboxylic acid
Answer: A
Explanation: Addition to an aldehyde gives a secondary alcohol.

JENPAS Chemistry · Haloalkanes and Haloarenes · Very Very Hard

20. Reaction of RMgX with a ketone followed by hydrolysis gives:

  • A. Primary alcohol
  • B. Secondary alcohol
  • C. Alkane
  • D. Tertiary alcohol
Answer: D
Explanation: Addition to a ketone forms a tertiary alcohol.

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