The structure of (B) is: | vedclass

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(D) The starting material is biphenyl-$2$,$2$'-dicarbaldehyde. Since there are no $\alpha$-hydrogens,it undergoes an intramolecular Cannizzaro reactio

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(D) The starting material is biphenyl-$2$,$2$'-dicarbaldehyde. Since there are no $\alpha$-hydrogens,it undergoes an intramolecular Cannizzaro reaction in the presence of concentrated $KOH$ and heat to form a salt of the hydroxy-acid intermediate $(A)$.$(A)$ is the potassium salt of $2-$(hydroxymethyl)biphenyl-$2$'-carboxylic acid.Upon treatment with $H^{\oplus}$ and heat,$(A)$ undergoes acid-catalyzed intramolecular esterification (lactonization) to form the cyclic product $(B)$,which is a lactone (specifically,$5$,$7$-dihydrodibenzo$[c,e]$oxepin$-5-$one).

The structure of $(B)$ is:

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