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Question

A compound have the vapour density of 29. When its aqueous alkaline solution is heated with I2, yellow precipitate forms. The compound may be:

A
CH3CH2CHO
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B
CH3COCH3
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C
CH3COOH
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D
CH2=CHCH2Br
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Solution

The correct option is A CH3COCH3
Vapour density of the compound is 29, so the molecular weight will be 58. The yellow precipitate is formed with alkaline aqueous iodine and it gives positive iodoform test. hence, the compound must be ketone.

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