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Question

Which is a Lewis base?

A
B2H6
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B
BCl3
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C
AlH3
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D
NH3
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Solution

The correct option is D NH3
Lewis Concept (Electronic concept) :
Lewis acid - species which can accept an electron pair with the formation of a coordinate bond.
Lewis base - species which has a lone pair of electrons available for donation.
NH3 already has a lone pair on nitrogen so it can donate a lone pair of electrons thus it does not act as a lewis base.
Except NH3, all have vacant orbital to accept lone pair electrons thus they can act as lewis acid. Hence correct option is d.

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