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Question
What is the action of HCN on ethanal?
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Solution
Ethanal reacts with HCN:
\[\begin{array}{cc}
\phantom{.}\ce{H}\phantom{..................}\ce{H}\phantom{}\\
\phantom{.}|\phantom{...................}|\phantom{}\\
\ce{\underset{(ethanal)}{CH3 - C = O} ->[HCN] CH3 - C - CN}\\
\phantom{....................}|\\
\phantom{......................}\ce{\underset{(Acetaldehyde cyanohydrin)}{OH}}
\end{array}\]
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