Question
What is the difference between nucleophilic reaction and electrophilic reaction. Give one example.

Answer

In nucleophilic reaction nucleophile attacks the electrophilic centre in the substrate and brings about a nucleophilic reaction whereas, in electrophilic reaction an electrophile attacks a nucleophilic centre in the substrate and brings about an electrophilic reaction.
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Here, the nucleophilic centre $N:$ in the nucleophile $NH_3$ attacks the electrophilic centre $‘B \ ’$ in the electrophile $BF_3$ to form the product.

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