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Q.

A ketone gives a yellow precipitate when treated with I2 in an alkaline solution. Thus, the ketone is 

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a

cyclic ketone 

b

A methyl ketone

c

An unsaturated ketone

d

diethyl ketone

answer is B.

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Detailed Solution

Carbonyl groups that have a methyl group directly attached to the carbonyl carbon atom -CO-CH3 give the iodoform test. In this test, I2 with an alkali (NaOH) is treated with carbonyl compounds and the compounds that give the iodoform test give a yellow precipitate of CHI3.

Among the given option, only methyl ketone gives the iodoform test as it has a methyl group that is directly attached to the carbonyl carbon atom.

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