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(A) The reaction of acetaldehyde $(CH_3CHO)$ with $HCN$ produces a cyanohydrin: $CH_3CHO + HCN \rightarrow CH_3-CH(OH)-CN$. Upon hydrolysis,the cyano

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Optical isomerism

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(A) The reaction of acetaldehyde $(CH_3CHO)$ with $HCN$ produces a cyanohydrin: $CH_3CHO + HCN \rightarrow CH_3-CH(OH)-CN$. Upon hydrolysis,the cyano group $(-CN)$ is converted into a carboxylic acid group $(-COOH)$,yielding $CH_3-CH(OH)-COOH$ ($2$-hydroxypropanoic acid). This molecule contains a chiral carbon atom (the central carbon bonded to $-H$,$-OH$,$-CH_3$,and $-COOH$ groups),which allows it to exhibit Optical isomerism.

Reaction of acetaldehyde with $HCN$ followed by hydrolysis gives a compound which shows

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