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Q.

Which of the following are Lewis acids?

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a

PH3 and BCl3

b

AlCl3 and PH3

c

PH3 and SiCl4

d

BCl3 and AlCl3

answer is D.

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Detailed Solution

Electron pair acceptor is Lewis acid. In case of BCl3 and AlCl3 both central atoms (B,Al) have vacant p-orbitals and Incompleted octet. Hence  they can accept a electron pair acts as Lewis acids.
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