An example of a Lewis acid is

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(C) Lewis acid is defined as an electron pair acceptor.$AlCl_3$ acts as a Lewis acid because the central $Al$ atom has an incomplete octet (only $6$ e

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$AlCl_3$

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(C) Lewis acid is defined as an electron pair acceptor.$AlCl_3$ acts as a Lewis acid because the central $Al$ atom has an incomplete octet (only $6$ electrons in its valence shell),allowing it to accept a lone pair of electrons.While $SnCl_4$ can also act as a Lewis acid due to vacant $d$-orbitals,$AlCl_3$ is the most classic textbook example of an electron-deficient Lewis acid.

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