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Iodoform is formed from all of the following except:

1. Ethyl methyl ketone
2. Propan-2-ol
3. 3-Methyl-2-butanone
4. 2-Methyl-1-propanol

Correct answer: 2-Methyl-1-propanol

Solution

Iodoform requires a CH3-CO- or CH3-CH(OH)- group. 2-Methyl-1-propanol, (CH3)2CHCH2OH, has no such group and cannot give iodoform. Ethyl methyl ketone, propan-2-ol, and 3-methyl-2-butanone all contain a CH3CO/CH3CHOH unit and do react.

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