Question

Which of the following compounds does not give a positive iodoform test?

• A. Ethanol
• B. Acetone
• C. Acetaldehyde
• D. Methanol

Answer 1

The correct option is D Methanol

Iodoform test is given by aldehydes or ketones having $\alpha$ methyl group.(-$COC{H}_3$)

Even alcohols having $\alpha$ methyl group can also show the iodoform test.

Thus, methanol does not show this reaction as it does not have an $\alpha$ methyl group.

This reaction is also used to distinguish ethanol and methanol.

Option D is correct.