Q. Benzene carbaldehyde is reacted with conc. $NaOH$ solution to give the products $AB$. The product $A$ can be used as a food preservative and the product $B$ is an aromatic hydroxy compound, where $- OH$ group is linked to sp $^{3}$-hybridised $C$-atom next to benzene ring. The products $A$ and $B$ respectively are
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Solution: