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Which of the following set of compounds are Lewis acids ?

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PH₃ and BCl₃

AlCl₃ and ${SiCl}_{4}$

PH₃ and SiCl₄

BCl₃ and AlCl₃

answer is D.

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Detailed Solution

In both BCl₃ and AlCl₃, central metal atom has incomplete octet, due to which they are electron deficient and behave as Lewis acids.

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