Given below are two statements: one is labelled as Assertion A and the other is labelled as Reasons R :
Assertion A : The H-O-H bond angle in water molecule is .
Reason R : The lone pair- lone pair repulsion of electrons is higher than the bond pair- bond pair repulsion.
In the light of the above statements, choose the correct answer from the options given below:
Assertion A : The H-O-H bond angle in water molecule is .
Reason R : The lone pair- lone pair repulsion of electrons is higher than the bond pair- bond pair repulsion.
In the light of the above statements, choose the correct answer from the options given below:
- (A) is false but is true
- (B)Both A and are true, and is the correct explanation of ✓ Correct
- (C) is true but is false
- (D)Both and are true, but is not the correct explanation of
Answer: (B)
Solution
Oxygen in water carries four electron pairs, two bonding and two non-bonding, so the parent electron arrangement is tetrahedral and the shape is bent.
A lone pair is held by one nucleus only and spreads over a wider angle than a bond pair, which is pulled in by two nuclei. The repulsion order lone pair-lone pair lone pair-bond pair bond pair-bond pair therefore holds, and the two lone pairs squeeze the two O-H bonds together, closing the angle from the regular tetrahedral to .
Both A and R are true, and R is the correct explanation of A.
A lone pair is held by one nucleus only and spreads over a wider angle than a bond pair, which is pulled in by two nuclei. The repulsion order lone pair-lone pair lone pair-bond pair bond pair-bond pair therefore holds, and the two lone pairs squeeze the two O-H bonds together, closing the angle from the regular tetrahedral to .
Both A and R are true, and R is the correct explanation of A.
JEE Main · 2021 · 16 Mar 2021 · Shift 1 · Single correct option