4-formylbenzoic acid on treatment with one eq | vedclass

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Question

(B) $4$-formylbenzoic acid contains both an aldehyde group $(-CHO)$ and a carboxylic acid group $(-COOH)$.When treated with one equivalent of hydrazin

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(B) $4$-formylbenzoic acid contains both an aldehyde group $(-CHO)$ and a carboxylic acid group $(-COOH)$.When treated with one equivalent of hydrazine $(NH_2NH_2)$,the more reactive aldehyde group forms a hydrazone.Subsequent heating with alcoholic $KOH$ triggers the Wolff-Kishner reduction of the hydrazone to a methyl group $(-CH_3)$.Meanwhile,the carboxylic acid group reacts with the base $(KOH)$ to form a potassium carboxylate salt $(-COO^-K^+)$.Therefore,the major product is $4$-methylbenzoate potassium salt.

$4$-formylbenzoic acid on treatment with one equivalent of hydrazine followed by heating with alc. $KOH$ gives the major product:

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