Which compound will give a positive iodoform test with ${\text{I}}_2$ and $\text{NaOH}$?

Solution

1. The iodoform test is positive for compounds with ${\text{CH}}_3\text{CO}-$ or ${\text{CH}}_3\text{CH}(\text{OH})-$ groups.
2. Ethanol contains the ${\text{CH}}_3\text{CH}(\text{OH})-$ structural unit.
3. Ethanol reacts with ${\text{I}}_2$ and $\text{NaOH}$ to form yellow ${\text{CHI}}_3$ precipitate.
4. Hence the answer is (C).