Identify the major product of the following r | vedclass

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(C) The given reactant is $2,2',6,6'$-tetrabenzenedicarbaldehyde. When treated with $NaOH$ at $100 \ ^\circ C$,it undergoes an intramolecular Cannizza

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(C) The given reactant is $2,2',6,6'$-tetrabenzenedicarbaldehyde. When treated with $NaOH$ at $100 \ ^\circ C$,it undergoes an intramolecular Cannizzaro reaction. In this reaction,one $-CHO$ group is oxidized to a $-COO^-$ group,and the adjacent $-CHO$ group is reduced to a $-CH_2OH$ group. This occurs on both benzene rings. Upon subsequent acidification with $H^+ / H_2O$,the carboxylate ions are protonated to form carboxylic acid groups. The final product is $2,2'$-bis(hydroxymethyl)-[$1$,$1$'-biphenyl]-$6$,$6$'-dicarboxylic acid.

Identify the major product of the following reaction:

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