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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