Answer:
(a) \[O{{H}^{-}}\] is Lewis
base because it acts as
electron pair donor.
(b) \[{{F}^{-}}\]is
also Lewis base.
(c) \[{{H}^{+}}\] is
Lewis acid because it acts as electron pair acceptor.
(d) \[BC{{l}_{3}}\] is electron deficient compound, it acts
as electron pair acceptor, i.e., Lewis acid.
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