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Which of the following are Lewis acids ? (1) AlCl3 and SiCl4

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Which of the following are Lewis acids ? 

(1) AlCl3 and SiCl4 

(2) PH3 and SiCl4 

(3) BCl3 and AlCl3 

(4) PH3 and BCl3

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2 Answers

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Ans. (3)  BCl3 & AlCl3 both have vacant p-orbital & incomplete octet. So they act as Lewis acid. 

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BCl3 , AlCl3 and SiCl4 acts as Lewis acid.

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