1.

A compound has a vapour density of 29. on warming an aqueous solution of alkali, it gives a yellow precipitate. The compound is

Answer»

`CH_(3)CH_(2)CHO`
`CH_(3)CHOHCH_(3)`
`CH_(3)COCH_(3)`
`CH_(3)CH_(2)COOH`

Solution :Molecular WEIGHT of the COMPOUND `= 2xx` Vapour density `= 2 xx 29 = 58`
Molecular weight of `CH_(3)CH_(2)CHO, CH_(3)CHOHCH_(3), CH_(3)COCH_(3)` and `CH_(3)CH_(2)COOH` are 58,60,58 and 74 RESPECTIVELY. Both `CH_(3)CH_(2)CHO` and `CH_(3)COCH_(3)` have molecular weight 58 but only aldehyde i.e., `CH_(3)CH_(2)CHO` on warming with AQUEOUS alkali gives yellow precipitate.


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