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

When BF_3 is treated with LiH at 450 K, a hydride of borbon is formed. Briefly explain the structure of the above mentioned hydride.

When BF_3 is treated with LiH at 450 K, a hydride of borbon is formed. Identify the hydride of boron formed in the above reaction.

BCl_3 is a good Lewis acid. Why?

Why does BF_3 behave as a Lewis acid?

Why does boron trifluoride behave as a Lewis acid?

Why does BF_3' act as a lewis acid?

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

When a mixture of benzaldehyde and acetophenone is treated with dil.NaOH and heated to form an alpha, beta -unsaturated carbonyl compound, which of the following statements are correct about this reaction?