Subjective Type

Propose the mechanism for the following reaction: $$CH_3\ CHO+\ HCN \xrightarrow [ ]{ { H }_{ 2 } } \begin{matrix} { CH }_{ 3 }- & CH- & CN \\ & | & \\ & OH & \end{matrix}$$

Solution

The reaction proceeds through the nucleophilic attack of $$CN^-$$ ion as follows:

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