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,which means it has

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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,which means it has an incomplete octet.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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