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Question

Which of the following species is not a Lewis acid?

A
BF3
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B
Cu2+
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C
NH3
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D
AlCl3
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Solution

The correct option is C NH3
Species which can accept a pair of electrons from another species.
NH3 can donate a pair of electrons while Cu2+, AlCl3, BF3 can accept lone pair of electron since they have vacant orbitals.
hence, NH3 is a lewis-base while remaining species are lewis-acid.

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