Ncert Exercises & Solutions

10.15 Write the mechanism of the following reaction:

nBuBr + KCN nBuCN

The given reaction is:

$n B u B r + K C N \overset{E O H - H_{2} O}{\to} n B u C N$

The given reaction is an S $_{N}$ 2 reaction. In this reaction, CN $^{-}$ acts as the nucleophile and
attacks the carbon atom to which Br is attached. CN $^{-}$ ion is an ambident nucleophile and
can attack through both C and N. In this case, it attacks through the C-atom.

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