The given reaction is an SN2 reaction. In this reaction, CN acts as the stronger nucleophile and attacks the carbon atom to which Br is attached in nBuBr.
And, CN- ion is an ambident nucleophile and can attack through both C and N. In this case, it attacks through the C-atom.
The mechanism is shown below:
<p>The given reaction is a nucleophillic reaction:</p><p><picture><img src="https://images.shiksha.com/mediadata/images/articles/1690442200phpUgB9t2.jpeg" alt="" width="288" height="41"></picture></p><p>The given reaction is an SN2 reaction. In this reaction, CN acts as the stronger nucleophile and attacks the carbon atom to which Br is attached in nBuBr.</p><p>And, CN<sup>-</sup> ion is an ambident nucleophile and can attack through both C and N. In this case, it attacks through the C-atom.</p><p>The mechanism is shown below:</p><div><div><picture><source srcset="https://images.shiksha.com/mediadata/images/articles/1690442257phpeEdiKq_480x360.jpeg" media=" (max-width: 500px)"><img src="https://images.shiksha.com/mediadata/images/articles/1690442257phpeEdiKq.jpeg" alt="" width="" height=""></picture></div></div>
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