Question:

Which is the major product formed when acetone is heated with iodine and potassium hydroxide?

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This is the iodoform reaction of a methyl ketone.
Updated On: Nov 11, 2026
  • Acetophenone
  • Iodoform
  • Iodoacetone
  • Acetic acid
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The Correct Option is B

Solution and Explanation

Acetone has a \(\mathrm{CH_3CO-}\) group, so \(\mathrm{I_2/KOH}\) (i.e. \(\mathrm{KOI}\)) triple-halogenates the methyl group: \(\mathrm{CH_3COCH_3 \to CI_3COCH_3}\).
Hydroxide attacks the carbonyl carbon and expels \(\mathrm{CI_3^-}\): \(\mathrm{CI_3COCH_3 + OH^- \to CHI_3 + CH_3COO^-}\).
The yellow precipitate formed is iodoform, \(\mathrm{CHI_3}\).
Answer: (2) Iodoform
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