Which of the following sets contains Lewis acids only?

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${BF}_{3}, {NH}_{3}, H_{2} O$

${BF}_{3}, {Ni}^{2 +}, {SnCl}_{4}$

${NH}_{3}, C_{5} H_{5} N, H_{2} O$

${BF}_{3}, {SO}_{3}, {BeCl}_{2}$

answer is A.

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Detailed Solution

The species ${BF}_{3}, {Ni}^{2 +}$ and ${SnCl}_{4}$ can accept lone pair of electrons.

A Lewis base and an empty orbital that may receive a pair of electrons to form a Lewis adduct make up this chemical entity. Trimethylborane qualifies as a Lewis acid since it may receive a lone pair.

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