Question

What is back bonding and how does it affect the acid strength??

Answer 1

Answer:

Hence, effectiveness of back bonding with Boron decreases down the halogen group. As for acid strength, bf3, bbr3 etc. are lewis acids because the central atom is short of an electron pair. If the back bonding is effective, the shortage of electrons is somewhat compensated and the lewis acid character is decreased.

Answer 2

Answer:

back bonding of atoms decreases due to halogen