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Which of the following are Lewis acids?

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By Expert Faculty of Sri Chaitanya
a
PH3 and BCl3
b
AlCl3 and PH3
c
PH3 and SiCl4
d
BCl3 and AlCl3
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detailed solution

Correct option is D

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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