Home Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) Compounds of Boron and Aluminium Which of the following is a monobasic Lewis …
Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) Compounds of Boron and Aluminium Single Correct MCQ
Published on: August 13, 2026

Which of the following is a monobasic Lewis acid ?

A
B(OH) 3
B
PO(OH) 3
C
SO 2 (OH) 2
D
ClO 3 (OH)

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Text Solution

Verified by Experts
The correct answer is:
A

It is a weak monobasic acid and in aqueous solution the boron atom completes its octet by

accepting OH – from water molecules:

B(OH) 3 (aq) + 2H 2 O(l) [B(OH) 4 ] – (aq) + H 3 O + (aq). pK = 9.25.

It, therefore, functions as a Lewis acid and not as a proton donor like most acids.

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