The tendency of BF_(3),BCl_(3) and BBr_(3) to have as Lewisacid decreases in the sequence

The tendency of BF_(3),BCl_(3) and BBr_(3) to have as Lewisacid decrea

1.	The tendency of BF_(3),BCl_(3) and BBr_(3) to have as Lewisacid decreases in the sequence
Answer» `BF_(3) lt BCl_(3) gt BBr_(3)` `BCl_(3) gt BF_(3) gt BBr_(3)` `BBr_(3) gt BCl_(3)gt BF_(3)` `BBr_(3) gt BF_(3) gt BCl_(3)` Solution :As the extent of `ppi-ppi` back bonding decreases with increase in the SIZE of the halogen, electron-deficiencyincreases , i.e., OPTION (c ) is correct.