Question

The main factor responsible for acidic nature of $B{F}_3$ is

• A. $p\pi -d\pi$ back-bonding
• B. three centre-electron bonds in $B{F}_3$
• C. large electronegativity of F
• D. $p\pi -p\pi$ back-bonding.

Answer 1

Answer: (D)

$p\pi -p\pi$ back-bonding is responsible for acidic nature of boron halides. Smaller atoms show more backbonding.