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Question

Which of the following is not a Lewis acid?


A
Aluminum chloride
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B
Ammonia
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C
Sulphur trioxide
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D
Cupric ion
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Solution

The correct option is B Ammonia
Aluminium, copper and sulphur have vacant d orbitals so they accepts pair of electron so they acts as Lewis acids.

Ammonia have 1 lone pair with it which can be donated so it acts as Lewis base.

Option B is correct.

Chemistry

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