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Question

Which of the following is lewis acid?

A
NH3
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B
AlCl3
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C
PH3
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D
None of the above
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Solution

The correct option is B AlCl3
Species which can accept a pair of electrons from another species is called as Lewis acid.
AlCl3 has vacant p orbital and thus it can accept a pair of electrons and hence is lewis acid.
NH3,PH3 are Lewis bases.

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