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(D) Xylenes are dimethyl derivatives of benzene. There are three isomers of xylene: $o$-xylene,$m$-xylene,and $p$-xylene.When these isomers are oxidiz

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(D) Xylenes are dimethyl derivatives of benzene. There are three isomers of xylene: $o$-xylene,$m$-xylene,and $p$-xylene.When these isomers are oxidized with acidic $KMnO_4$,the methyl groups are oxidized to carboxylic acid groups $(-COOH)$.$o$-Xylene gives phthalic acid (benzene$-1,2-$dicarboxylic acid).$m$-Xylene gives isophthalic acid (benzene$-1,3-$dicarboxylic acid).$p$-Xylene gives terephthalic acid (benzene$-1,4-$dicarboxylic acid).Since all three isomers are xylenes,they yield their respective dicarboxylic acids upon oxidation.

Xylenes on oxidation with acidic $KMnO_4$ give:

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