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Which of the above compound(s), on being warmed with iodine solution and NaOH, will give iodoform?

1. (a) (1) and (2)
2. (b) (1), (3) and (4)
3. (c) only (2)
4. (d) (1), (2) and (3)

Correct answer: (d) (1), (2) and (3)

Solution

The iodoform test is positive for compounds containing a methyl ketone group (CH3CO-) or secondary alcohols that can be oxidized to methyl ketones. Compounds (1), (2), and (3) meet this criterion.

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