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Question
What is meant by the following term? Give an example of the reaction in the following case.
Cyanohydrin
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Solution
Aldehydes and ketones react with hydrogen cyanide (HCN) to yield cyanohydrins. This reaction occurs very slowly with pure HCN. Therefore, it is catalysed by a base and the generated cyanide ion (CN−) being a stronger nucleophile readily adds to carbonyl compounds to yield corresponding cyanohydrin.
\[\ce{HCN + O\overset{-}{H} <=> {_{\bullet}^{\bullet}}\overset{-}{C}N + H2O}\]
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