Which of the following is not an electrophile

N O_{2}

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N a^{+}

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H^{+}

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B F_{3}

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Solution

The correct option is A $N O_{2}$
Hence an unpaired electron remains on the nitrogen atom which is then ionised to get a +ve charge (formal charge) on nitrogen. As nitrogen doesn't have an octet around it, hence it always craves for an electron and also the resonance between the N-O bonds make it a strong electrophile.

Hence , option A is correct .

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