Question

Is it necessary for having same bond order, the no. Of valence electron should be same

Answer 1

Answer:

Bond number is the number of electron pairs (bonds) between a pair of atoms.[1] For example, in diatomic nitrogen N≡N the bond number is 3, in acetylene H−C≡C−H the bond number between the two carbon atoms is also 3, and the C−H bond order is 1. Bond number gives an indication of the stability of a bond. Isoelectronic species have same bond number.[2]

In molecules which have resonance or nonclassical bonding, bond number may not be an integer. In benzene, the delocalized molecular orbitals contain 6 pi electrons over six carbons essentially yielding half a pi bond together with the sigma bond for each pair of carbon atoms, giving a calculated bond number of 1.5. Furthermore, bond numbers of 1.1, for example, can arise under complex scenarios and essentially refer to bond strength relative to bonds with order 1.