Which one is a Lewis acid?

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(B) Lewis acid is defined as an electron-pair acceptor.$Ag^{+}$ is a metal cation with an incomplete valence shell,making it electron-deficient.Theref

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$Ag^{+}$

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(B) Lewis acid is defined as an electron-pair acceptor.$Ag^{+}$ is a metal cation with an incomplete valence shell,making it electron-deficient.Therefore,$Ag^{+}$ can accept an electron pair from a Lewis base to form a coordinate bond,acting as a Lewis acid.$Cl^{-}$,$C_2H_5OH$,and $S^{2-}$ possess lone pairs of electrons and act as Lewis bases.

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