Which of the following is a Lewis acid?

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Question

(A) Lewis acid is defined as an electron-pair acceptor.$AlCl_3$ is an electron-deficient compound because the central $Al$ atom has only $6$ electrons

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$AlCl_3$

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(A) Lewis acid is defined as an electron-pair acceptor.$AlCl_3$ is an electron-deficient compound because the central $Al$ atom has only $6$ electrons in its valence shell (an incomplete octet).Therefore,it can accept a lone pair of electrons from a Lewis base to complete its octet,making it a Lewis acid.$NCl_3$ has a lone pair on $N$,$SF_6$ has an expanded octet (stable),and $CCl_4$ has a complete octet,so they do not act as Lewis acids in this context.

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