Which of the following is not a Lewis acid?

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(D) $Lewis$ acid is a substance that can accept a pair of non-bonding electrons.$AlCl_3$,$SnCl_4$,and $FeCl_3$ are electron-deficient compounds (incom

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$AlCl_3 \cdot 6H_2O$

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(D) $Lewis$ acid is a substance that can accept a pair of non-bonding electrons.$AlCl_3$,$SnCl_4$,and $FeCl_3$ are electron-deficient compounds (incomplete octet or vacant d-orbitals) and act as $Lewis$ acids.$AlCl_3 \cdot 6H_2O$ is a hydrated salt where the $Al^{3+}$ ion is already coordinated with six water molecules,satisfying its coordination requirement. Therefore,it does not act as a $Lewis$ acid in this form.

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