nitrogen cannot form `dpi-p PI` bond single N-N bond is weaker than the single P-P bond `N_(2)O_(4)` has two resonance structures The stability of HYBRIDESINCREASES from `NH_(3)` to `BiH_(3)`due to increase in size of the central ATOM
Solution :The stability of hybrides of group-15 decreases from `NH_(3)` to `BiH_(3)` due to increase in size of the central atom.