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Following compounds are given: (1) CH3CH2OH (2) CH3COCH3 (3) CH3CHO (4) CH3OH. Which of the following compounds will give a positive iodoform test?

1. CH3CH2OH
2. CH3COCH3
3. CH3CHO
4. CH3OH

Correct answer: CH3COCH3

Solution

The iodoform test is given by compounds containing a methyl ketone group (-COCH3) or secondary alcohols that can be oxidized to methyl ketones. Among the options, CH3COCH3 (acetone) contains the methyl ketone group and will give a positive iodoform test.

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