Which of the following is not a Lewis acid?

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${SnCl}_{2}$

${NH}_{4}^{+}$

${NH}_{3}$

both ${NH}_{3} and {NH}_{4}^{+}$

answer is D.

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Detailed Solution

${SnCl}_{2}$ has an empty orbital and accepts electrons. Hence, it is a Lewis acid ${NH}_{3} and {NH}_{4}^{+}$ don’t have empty orbitals. Hence, they are not Lewis acids.

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