Which of the following compounds can act as a Lewis base?

H C l O_{2}

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{N H}_{2} {N H}_{2}

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{N H}_{4}^{+}

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{B F}_{3}

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Solution

The correct option is D ${N H}_{2} {N H}_{2}$
A species which has a lone pair of electrons and donates it in the acid-base reaction is known as Lewis base. From the given options, $N H_{2} - N H_{2}$ has a lone pair acceptor species or a Lewis acid. $N H_{4}^{+}$ is electron deficient. $B F_{3}$ , on the other hand, is a Lewis acid. $H C l O_{2}$ is acid. Hence, $N H_{2} N H_{2}$ can act as Lewis base.

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