Which among the following qualifies as a Lewis acid?

N a F

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N a C l

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{B F}_{3}

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M g {C l}_{2}

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Solution

The correct option is C ${B F}_{3}$
Lewis acid is an specie which can accept a lone pair of electrons. As $B F_{3}$ has vacant 2p orbital so it can accepts lone pair of electrons so it behaves as lewis acid.

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