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Which of the following is NOT a starting material used for the preparation of iodoform?

1. CH3CH(OH)CH3
2. CH3CH2OH
3. HCH2OH
4. CH3COCH3

Correct answer: HCH2OH

Solution

The iodoform reaction needs a CH3-CO- or CH3-CH(OH)- group. HCH2OH (methanol, CH3OH has no such grouping... it is just CH3OH) cannot give iodoform, whereas isopropanol, ethanol, and acetone all can. So methanol is not a starting material.

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