Question

Which of the following fluoro-compounds is most
likely to behave as a Lewis base?
[NEET (Phase-2) 2016]
(1) BF3
(2) PF3
(3) CF4
(4) SiF4​

Answer 1

Answer:

The correct option is : (b) PF3

Explanation:

BF3 → Lewis acid (incomplete octet)

PF3 → Lewis base (presence of lone pair on p atom)

CF4 → Complete octet

SiF4 → Lewis acid (empty d-orbital in Si-atom)

Answer 2

Option 2] PF3

Explanation:

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