Which of the following fluoro compounds is most likely to behave as a Lewis base?
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a
BF3
b
PF3
c
CF4
d
SiF4
answer is B.
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Detailed Solution
BF3⟶ Lewis acid (incomplete octet) PF3⟶ Lewis base (presence of lone pair on P -atom) CF4⟶ Complete octet , non availability of vacant d orbitals →Neither Lewis acid nor Lewis baseSiF4⟶ Lewis acid (empty d -orbital in Si-atom)