p-Block Elements-I - Result Question 38

####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

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Answer:

Correct Answer: 9. (a)

Solution:

  1. Orthoboric acid is a weak, monobasic, Lewis acid.

$p \pi-p \pi$ backbonding between ’ $B$ ’ and ’ $O$ ’ decreases acid strength greatly :



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