Which of the following does not give iodoform :

Acetic acid.

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lactic acid.

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Actophenone.

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propionic acid.

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Solution

The correct options are
A Acetic acid.
C propionic acid.
The reaction of iodine and base with methyl ketones is called the "iodoform test". It is used to probe the presence of a methyl ketone. Carboxylic acids react as acid with the base and hence do not form $C I_{3}$ because the $C = O$ in the $C O O H$ has delocalisation over the group. Thus, carboxylic acids (options A and D) do not give iodoform test.

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