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Amongst the given options, which of the following molecules/ion acts as a Lewis acid?
A
$OH^-$
B
$NH_3$
C
$H_2O$
D
$BF_3$
Explanation
BF3 has an incomplete octet on boron, so it accepts a lone pair.
Detailed Solution
$BF_3$ behaves as Lewis acid due to incomplete octet in valence shell of Boron. Hence it can accept a lone pair of electrons.