Find the Lewis base among the following.

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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None of the above

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Solution

The correct option is D ${N H}_{2} {N H}_{2}$
Hydrazine $N H_{2} N H_{2}$ is a Lewis base as it can donate an electron pair.

On the other hand, $H C l O_{2}$ , $N H_{4}^{+}$ and $B F_{3}$ are Lewis acids as they can accept an electron pair.

Note: A Lewis acid accepts an electron pair and a lewis base donates an electron pair.

Option B is correct.

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