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Classify the following species into Lewis acids and Lewis bases and show how these act as Lewis acid/base : `(a) OH^(-) " " (b) F^(-) " " (c)H^(+) " " (d)BCl_(3)`

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(a) `OH^(-)` can donate electron pair. Hence, it is a Lewis base
(b) `F^(-)` can also donate electron pair. Hence, it is a Lewis base
(c) `H^(+)` can accept electron pair. Hence, it is a Lewis acid
(d) `BCl_(3)` is deficient is electrons. Hence, it can accept electron pair and is, therefore, a Lewis acid.

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