Consider the following species : CN+,CN-,NO and CN . Which one of these will have the highest bond order?
NO
CN-
CN+
CN
NO:(σ1s)2,σ⋆1s2,(σ2s)2,σ*2s2,σ2pz2,π2px2=π2py2,π⋆2px1=π⋆2py0
B. O.=10-52=2.5
CN-:(σ1s)2,σ⋆1s2,(σ2s)2,σ*2s2,π2px2=π2py2,σ2pz2
B.O. =10-42=3
CN:(σ1s)2,σ⋆1s2,(σ2s)2,σ⋆2s2,π2px2=π2py2,σ2pz1
B.O·=9-42=2.5
CN+:(σ1s)2,σ⋆1s2,(σ2s)2,σ⋆2s2,π2px2=π2py2
B.O. =8-42=2
Hence, CN-has highest bond order.