Among the following species, identify the pair having same bond order CN−,O2−,NO+,CN+

Species having the same number of electron, have same bond order.Since, CN- and NO+ have same number of electrons, they have same bond order, i.e., 3.CN−or NO+=14=σ1s2,σ∗1s2,σ2s2,σ∗2s2,σ2pz2,π2px2≈π2py2 Bond order =Nb−Na2               =10−42=3