Which of the following is a Lewis acid?

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(A) Lewis acid is defined as an electron-pair acceptor. In $BF_3$,the central boron atom has only $6$ electrons in its valence shell,meaning it has an

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$BF_3$

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(A) Lewis acid is defined as an electron-pair acceptor. In $BF_3$,the central boron atom has only $6$ electrons in its valence shell,meaning it has an incomplete octet and a vacant $p$-orbital. Therefore,it can accept a lone pair of electrons to complete its octet,making it a Lewis acid. $Cl^{-}$,$H_2O$,and $NH_3$ all possess lone pairs of electrons and act as Lewis bases.

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