Which of these is least likely to act as a Lewis base?

1 2013 NEET EquilibriumLewis acids and bases Easy
Which of these is least likely to act as a Lewis base?
A $PF_3$
B CO
C $F^-$
D $BF_3$

Detailed Solution

$BF_3$ has an incomplete octet on boron and accepts an electron pair, so it is a Lewis acid.
$PF_3$, CO and $F^-$ have lone pairs to donate.

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