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Which of the following is not a Lewis acid ? (A) AlCl3 (B) BF3 (C) NH3 (D) FeCl3

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Which of the following is not a Lewis acid ?

(A) AlCl3

(B) BF3

(C) NH3

(D) FeCl3

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Correct option is (C) NH3

A Lewis acid is a species that contains an empty orbital and is of capable of accepting an electron pair from a Lewis base to form a Lewis adduct.

Examples of Lewis acid are: AlCl3, BF3, FeCl3, CO2, SO3.

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