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Explain the following reaction: n-BuBr+KCN overset("EtOH"-H_(2)O)ton-BuCN. |
Answer» Solution :KCN is RESONANCE hydride of the following two CONTRIBUTING STRUCTURES:  Thus, `CN^(-)` ion is an ambident nucleophile. Therefore, it can attack the carbon atom of C-Br bond in N-BuBr either through C or N. SINCE C-C bond is stronger than C-N bond, therefore, attack occurs through C to form n-butyl cyanide. 
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