In the reaction between `NH_3` and `BF_3` ammonia acts as………… (Lewis base, Lewis acid, brownsted base)

Explain Lewis Concept of acids and bases.

Boron halides can act as Lewis acids. Give reason.

BCl_3 is a good Lewis acid. Why?

explain the Lewis concept of acids and base.

Why does BF_3 behave as a Lewis acid?

Why does BF_3' act as a lewis acid?

The substance which can accept electrons is a Lewis acid. 'BCl_3, BF_3' and 'BBr_3' are Lewis acids. a. Arrange the above Lewis acids in the increasing,order of their acid strength. b. Give reason for this order of acidic strength, c. The chemistry of boron is different from that of other members of the same group. Mention any two differences and give reason.

Which of the following can act both as a bronsted acid amd a bronsted base?

Classify the following species into Lewis acids and Lewis bases and show how these act as Lewis acid/ base: (a) 'OH'- (b) F'- (c) 'H^+(d) BCl_3' ?

exlain the concept of Lewis acids and Lewis bases with Suitable examples.