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Question
How will you convert benzaldehyde into the following compound?
α-hydroxy phenyl acetic acid
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Solution
Conversion of benzaldehyde into 2-hydroxy phenyl acetic acid:
\[\begin{array}{cc}
\phantom{................}\ce{H}\phantom{.......................}\ce{H}\phantom{}\\
\phantom{................}|\phantom{........................}|\phantom{}\\
\ce{\underset{(Benzaldehyde)}{C6H5CHO} ->[HCN] C6H5 - C - CN ->[H^+/H2O][excess] C6H5 - C - COOH}\\
\phantom{................}|\phantom{........................}|\phantom{}\\
\phantom{.....................}\ce{\underset{(Phenyl cyanohydrin)}{OH}}\phantom{.......}\ce{\underset{α-hydroxy phenyl acetic acid}{OH}}\phantom{}
\end{array}\]
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