Which of the following reactants on reaction | vedclass

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(B) The reaction of $2$-formylbenzoic acid (phthalaldehyde acid) with concentrated $NaOH$ is a classic example of the Cannizzaro reaction. Since the m

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$2$-Formylbenzoic acid

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(B) The reaction of $2$-formylbenzoic acid (phthalaldehyde acid) with concentrated $NaOH$ is a classic example of the Cannizzaro reaction. Since the molecule contains both an aldehyde group $(-CHO)$ and a carboxylic acid group $(-COOH)$ in an ortho-position,the aldehyde group undergoes an intramolecular Cannizzaro reaction. The aldehyde group is oxidized to a carboxylate ion $(-COO^-)$ and reduced to a primary alcohol group $(-CH_2OH)$. This results in the formation of a hydroxy-acid intermediate,$2$-hydroxymethylbenzoic acid. Upon acidification,the carboxylic acid group and the alcohol group undergo intramolecular esterification (cyclization) to form the stable five-membered lactone,phthalide.

Which of the following reactants on reaction with conc. $NaOH$ followed by acidification gives the following lactone as the only product?

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