Question

If the central atom are more electronegetive than effect on bond angle

Answer 1

The electronegativity of the central atom does not really influence bond angles in any meaningful way. The size of atoms and the orbitals used and useable are much more important

Sometimes electronegativity or ‘lone pairs require space’ bcoz H2O has a smaller bond angle (105∘) than NH3 (107∘) or similar.