Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R :…

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R :

Assertion A : The H-O-H bond angle in water molecule is 104.5°.

Reason R : The lone pair - lone pair repulsion of electrons is higher than the bond pair - bond pair repulsion.

  1. A is false but R is true
  2. Both A and R are true, but R is not the correct explanation of A
  3. A is true but R is false
  4. Both A and R are true, and R is the correct explanation of A

Solution

H2O

θ=104.5°

The hybridisation of oxygen is water molecule is sp3.

So electron geometry of water molecule is tetrahedral, and the bond angle should be 109°28'' but as we know that lone pair-lone pair repulsion of electrons is higher than the bond pair-bond pair repulsion because lone pair occupies more space around central atom than that of bond pair, The H-O-H bond angle in water molecule is 104.5°.

Asked in: JEE Main 2021 (16 Mar Shift 1)

Practice more Chemical Bonding and Molecular Structure questions on Aicharya