The structure of (B) is | vedclass

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(A) The starting material is $2,2'$-diformylbiphenyl. When treated with concentrated $KOH$ and heat,it undergoes an intramolecular Cannizzaro reaction

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(A) The starting material is $2,2'$-diformylbiphenyl. When treated with concentrated $KOH$ and heat,it undergoes an intramolecular Cannizzaro reaction. One aldehyde group is reduced to a $-CH_2OH$ group,and the other is oxidized to a $-COOK$ group,forming intermediate $(A)$,which is potassium $2'$-(hydroxymethyl)biphenyl$-2-$carboxylate. Upon treatment with $H^+$ and heat,the carboxylic acid and alcohol groups undergo intramolecular esterification (cyclization) to form a cyclic ester (lactone) $(B)$.

The structure of $(B)$ is

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