Which of the following reactions will give al | vedclass

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Question

(A) In reaction $(a)$,acetaldehyde reacts with $NaCN/HCl$ to form acetaldehyde cyanohydrin,which upon acid hydrolysis yields lactic acid,which is an $

Vedclass · Accepted Answer

$CH_3-CHO \xrightarrow{(i) NaCN/HCl, (ii) H_2O/H^{+}/\Delta}$

Vedclass · Answer

(A) In reaction $(a)$,acetaldehyde reacts with $NaCN/HCl$ to form acetaldehyde cyanohydrin,which upon acid hydrolysis yields lactic acid,which is an $\alpha$-hydroxy acid: $CH_3-CHO + HCN$ $\rightarrow CH_3-CH(OH)CN$ $\xrightarrow{H_2O/H^{+}/\Delta} CH_3-CH(OH)COOH$. $(b)$ The Reformatsky reaction yields a $\beta$-hydroxy ester,which upon hydrolysis gives a $\beta$-hydroxy acid. $(c)$ Nucleophilic substitution of $X$ by $OH^-$ at the $\beta$-carbon yields a $\beta$-hydroxy acid.

Which of the following reactions will give $\alpha$-hydroxy acid as a product?

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