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Which types of chemical groups are known to produce a positive iodoform test?

1. Compounds containing the CH3–C=O group produce a positive iodoform test.
2. Compounds containing the CH3–CH group produce a positive iodoform test.
3. Both CH3–C=O and CH3–CH groups result in a positive iodoform test.
4. Neither of these groups leads to a positive iodoform test.

Correct answer: Both CH3–C=O and CH3–CH groups result in a positive iodoform test.

Solution

The iodoform test is given by compounds containing either the CH3–C=O group (methyl ketones) or the CH3–CH group (secondary alcohols with a methyl group attached to the carbon bearing the hydroxyl group). Thus, both groups qualify.

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