Why does `BF_3` behave as a Lewis acid?

Why does BF_3' act as a lewis acid?

Why does boron trifluoride behave as a Lewis acid?

When BF_3 is treated with LiH at 450 K, a hydride of borbon is formed. Boron compounds behave as Lewis acids. Why?

What are electron deficient hydrides? Whether they behave as Lewis acids or Lewis bases? Why?

BCl_3 is a good Lewis acid. Why?

How does H_2O_2 , behave as a bleaching agent?

Which of the following is untrue regarding BF_3 ? It is a Lewis acid , It is a planar molecule, It has a dipole moment, It forms a compound with NH_3