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  4. Which of the following is least likely to behave as Lewis base?

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Q. Which of the following is least likely to behave as Lewis base?

NEETNEET 2016Equilibrium

Solution:

$CO , F ^{-}$and $PF _3$ can either donate a lone pair of electron or pi electrons. Hence, they act as Lewis bases.
On the other hand, $BF _3$ has vacant orbital in which it can accent a lone pair of electrons or pi electrons. Hence, it acts as a Lewis acid. Thus, it has least tendency to act as a Lewis base.