Question

Explain why the bond angle in H2O,NH3,CH4 are different , though all are sp3 hybridized

Answer 1

In the H2O structure, there are two lone pair on the oxygen atom.
In NH3 structure,there is only one lone pair of electron on Nitrogen
In CH4 there are no lone pair of electron.

The lone pair of electron contribute to the difference in structure.different bond angle.
(Lone pair- Lone pair) repulsion more than (lone pair-bond pair)repulsion more than (bond pair-bond pair)