(C) Aluminum chloride $(AlCl_3)$ has an incomplete octet around the central aluminum atom. It has only $6$ electrons in its valence shell. Therefore,i

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(C) Aluminum chloride $(AlCl_3)$ has an incomplete octet around the central aluminum atom. It has only $6$ electrons in its valence shell. Therefore,it acts as an electron-pair acceptor. According to the Lewis concept,a substance that accepts an electron pair is a Lewis acid.