A) CO
B) \[{{F}^{-}}\]
C) \[B{{F}_{3}}\]
D) \[P{{F}_{3}}\]
Correct Answer: C
Solution :
Electron rich species are called Lewis base. Among the given, \[B{{F}_{3}}\] is an electron deficient species, so have a capacity of electron accepting instead of donating that's why it is least likely to act as a Lewis base. It is a Lewis acid.
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