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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.