The correct statement is

Options

A. `BI_(3)` is the weakest Lewis acid among the boron halides
B. there is minimum `p pi - p pi` back bonding in `BF_(3)`
C. `BF_(3)` is the strongest Lewis acid among the other boron halides
D. there is maximum ` p pi - p pi ` back bonding in `BF_(3)`

Answer

D

Explanation

There is maximum `p pi - p pi ` back bonding in `BF_(3)` due to identical size of 2p orbitals of B and F .