p-Block Elements-I 1 Question 9
9. $\mathrm{H} _{3} \mathrm{BO} _{3}$ is
$(2003,1 \mathrm{M})$
(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 ’ $\mathrm{B}$ ’ and ’ $\mathrm{O}$ ’ decreases acid strength greatly :
