Explain why `BF_(3)` is a weaker Lewis acid than `BCl_(3)`.

BF_3 is a weaker Lewis acid than BCl_3 -why?

Why is BF_(3) a weaker Lewis acid than BCI_(3) ?

Explain why PF_(3) is a stronger Lewis acid than PI_(3) .

Statement-1 BF_(3) is a weaker Lewis acid than BCl_(3) Statement -2: BF_(3) molecule is stabilized to a greater extent than BCl_(3) by p pi -p pi back bonding.

Explain giving reasons the following: BF_3 is a weaker Lewis acid than BCl_3