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JAMB Chemistry 1991 Question 46

Question 46

Hydrocarbons

CH3CH2CHXCH3 (alc. KOH) → CH3CH = CHCH3 + CH3CH2CH = CH2
The above reaction is an example of

  1. A.dehydration
  2. B.dehydrohalogenation
  3. C.neutralization
  4. D.a fission reaction
Show the answer and explanation

Answer: B (dehydrohalogenation)

Explanation

Alcoholic KOH removes H and the halogen X from neighbouring carbons to form an alkene. Removing a hydrogen halide is dehydrohalogenation.