Classify the following species into Lewis acids and Lewis bases and show how these act as Lewis acid/base: (a) ${O H}^{-}$ (b) $F^{-}$ (c) $H^{+}$ (d) ${B C l}_{3}$ .

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Solution

(a) $O H^{-}$ ion can donate an electron pair. Hence, it acts as Lewis base.
(b) $F^{-}$ ion can donate an electron pair. Hence, it acts as Lewis base.
(c) $H^{+}$ ion can accept an electron pair. Hence, it acts as Lewis acid.
(d) $B C l_{3}$ ion can accept an electron pair. Hence, it acts as Lewis acid.

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