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  4. Compound having formula C8H10 forms two isomers P and Q. On oxidation P gives benzoic acid and Q gives phthalic acid. The isomers P and Q are

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Q. Compound having formula $C_8H_{10}$ forms two isomers $P$ and $Q$. On oxidation $P$ gives benzoic acid and $Q$ gives phthalic acid. The isomers $P$ and $Q$ are

UP CPMTUP CPMT 2014

Solution:

Alk. $KM nO_4$ oxidises the entire side chain of alkyl benzene to $-COOH$ group irrespective of the length of the carbon chain. If there are two or more alkyl groups, each alkyl chain is oxidised to a $ -COOH$ group.
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