The major products P and Q in the following r | vedclass

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(A) The starting material is $4$-methylacetophenone. $(i)$ Treatment with excess $KMnO_4$ in the presence of $KOH$ and heat causes the oxidation of bo

Vedclass · Accepted Answer

$P$ = benzene$-1,4-$dicarboxylic acid,$Q$ = benzene$-1,4-$dimethanol

Vedclass · Answer

(A) The starting material is $4$-methylacetophenone. $(i)$ Treatment with excess $KMnO_4$ in the presence of $KOH$ and heat causes the oxidation of both the alkyl group $(-CH_3)$ and the acetyl group $(-COCH_3)$ attached to the benzene ring to carboxylate groups $(-COO^-)$. (ii) Subsequent acidification with $dil. H_2SO_4$ converts the carboxylate groups into carboxylic acid groups $(-COOH)$,yielding terephthalic acid (benzene-$1,4$-dicarboxylic acid) as product $P$. (iii) $LiAlH_4$ is a strong reducing agent that reduces both carboxylic acid groups to primary alcohol groups $(-CH_2OH)$. (iv) Final treatment with $H_3O^+$ yields benzene-$1,4$-dimethanol as product $Q$.

The major products $P$ and $Q$ in the following reaction sequence are

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