p-Block Elements-I - Result Question 9
####9. $H _3 BO _3$ is
$(2003,1 M)$
(a) monobasic acid and weak Lewis acid
(b) monobasic and weak Bronsted acid
(c) monobasic and strong Lewis acid
(d) tribasic and weak Bronsted acid
Show Answer
Answer:
Correct Answer: 9. (a)
Solution:
- Orthoboric acid is a weak, monobasic, Lewis acid.
$p \pi-p \pi$ backbonding between ’ $B$ ’ and ’ $O$ ’ decreases acid strength greatly :
