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Question

Which of the following alcohol gives Iodoform test?

A
methanol
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B
propan-2-ol
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C
pentan-3-ol
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D
Carbinol
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Solution

The correct option is A propan-2-ol
  • The compounds which give positive are the one with alpha-methyl groups.
  • To be more precise, Ethanal(Acetaldehyde) and methyl ketones.
  • Ethanal is the only aldehyde which gives a positive iodoform test. Thus, ketone and aldehyde with structure COCH3 also show positive results.
  • propan-2-ol is CH3CH(OH)CH3 thus it will have COCH3 group and hence gives a positive iodoform test.

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