The correct statement is

Options

A. There is minimum `p pi- p pi` back bonding in `BF_3`
B. There is maximum `p pi - p pi` back bonding in `BF_3`
C. `BI_3` is the weakest Lewis acid among the boron hilides.
D. `BF_3` is the strongest Lewis acid among the other boron halides.

Answer

B

Explanation

There is a maximum `p pi-p pi` back bonding in `BF_3`, due to identical size of 2p orbitals of B and F.