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7.40     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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Species which donate pair of an electron are called Lewis base and which accepts pair of electrons are called acid.

(a)  OH^-is a Lewis base since it can donate its lone pair of electrons.

(b) F^{-} is a Lewis base since it can donate a pair of electrons.

(c)  H^{+}is a Lewis acid since it can accept a pair of electrons.

(d)  BCl_{3} is a Lewis acid since it can accept a pair of electrons.

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