Q.

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)
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Which of the following fluoro compounds is most likely to behave as a Lewis base?