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JEE Main levelSingle correct optionDifficulty 2 of 3co149

Pentan-2-one, $CH X_{3} COCH X_{2} CH X_{2} CH X_{3}$ , is oxidised with hot alkaline $KMnO X_{4}$ and the mixture is acidified. By Popoff rule (the carbonyl group stays with the smaller alkyl group) the acids formed are

Amethanoic acid and butanoic acid
Bpropanoic acid only
Cethanoic acid and propanoic acid
Dtwo moles of ethanoic acid

Answer: C

The

C - C

bond that breaks is the one between

C = O

and the larger alkyl group (

CH X_{2} CH X_{2} CH X_{3}

). The

CH X_{3} CO

fragment gives ethanoic acid and the propyl fragment gives propanoic acid,

CH X_{3} CH X_{2} COOH

.

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