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Two aliphatic aldehydes P and Q react in...

Two aliphatic aldehydes P and Q react in th presence of aqueous `k_(2)CO_(3)` to give compound R, which upon treatment with HCN provides compound S. On acidification and heatingm,S gives the product shown below:

The compound S is

A

`H_(3)C-overset(CH_(3))overset(|)(CH)-underset(H_(2)C-CN)underset(|)(CH)-overset(O)overset(||)C-H`

B

C

`H_(3)C-overset(CH_(3))overset(|)(CH)-underset(H_(2)C-OH)underset(|)(CH)-overset(CH)overset(|)(CH)-OH`

D

Text Solution

Verified by Experts

The correct Answer is:
D

R react with HCN so, it must contain group. Since the compound S gives the given product formed on treartemen with `H^(+)` followed by heating thsu S must have a `-COOH` group with one carbon more than that in R.
Therefore P and Q are `(CH_(3)) CHCHO and HCHO` respectively
`H_(3)C-underset((P))underset("Methylpropanal")overset(CH_(3))overset(|)(CH)-overset(O)overset(||)C-H+H-underset((Q))underset("Methanal")overset(H)overset(|)C=Ooverset(K_(2)CO_(3)(aq.))rarr`
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