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A compound gives a yellow precipitate on...

A compound gives a yellow precipitate on warming with iodine and aq. Solution of NaOH. Its vapour density is 29 the compound is :

A

`CH_3CH_2CHO`

B

`CH_3CHOHCH_3`

C

`CH_3COCH_3`

D

`CH_3CH_2COOH`

Text Solution

Verified by Experts

The correct Answer is:
A
Molecular weight of the compound = `2 xx" Vapour density "implies 2xx 29 = 58`
Molecular weight of CH_3CH_2CHO, CH_3CHOHCH_3, CH_3COCH_3` and `CH_3CH_2COOH` are 58, 60, 58 and 74 respectively. Both `CH_3CH_2CHO` and `CH_3COCH_3` have molecular weight 58 but only aldehyde i.e., `CH_3CH_2CHO` on warming with aqueous alkali gives yellow precipitate.
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