Which of the following is not a Lewis acid ?

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SnCl₄

AlCl₃

AlCl₃.6H₂O

FeCl₃

answer is D.

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Detailed Solution

A Lewis acid is characterized by its ability to accept at least one lone pair using an empty orbital of right energy. AlCl₃, SnCl₄, and FeCl₃ act as Lewis acids because of the ability of their central atoms to accept lone pairs in their empty orbitals. AlCl₃.6H₂O or [Al(H₂O)₆]Cl₃ cannot act as a Lewis acid because the central ion Al³⁺ is no longer in a position to accept the lone pair as its coordination number is fulfilled.

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