Question

The main factor responsible for acidic nature of $BF_3$ is

• A. $p?-d?$ back-bonding
• B. three centre-electron bonds in $BF_3$
• C. large electronegativity of F
• D. $p?-p?$ back-bonding.

Answer 1

Answer: (D)

$p?-p?$ back-bonding.

Answer 2

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