Match the species in Column I with the bond order in Column II.

Column I

Column II

A. NO

1. 1.5

B. CO

2. 2.0

C. O2-

3. 2.5

D. O2

4. 3.0

Codes

Options:  A   B   C   D 
1. 3 4 1 2
2. 1 2 3 5
3. 5 4 3 2
4. 4 5 3 2

 
A.(3) B.(4) C.(1) D.(2)
A. NO(7+8=15)=σ1s2, σ*1s2, σ2s2, σ*2s2, σ2pz2, π2px2π2py2, π*2px1
Bond order=12(Nb-Na)=10-52=2.5
B. CO(6+8=14)=σ1s2, σ*1s2, σ2s2, σ*2s2, σ2pz2, π2px2π2py2
Bond order=12(Nb-Na)=10-42=3
C. O2-(8+8+1=17)=σ1s2, σ*1s2, σ2s2, σ*2s2, σ2pz2, π2px2π2py2, π*2px2π*2py1
Bond order=12(Nb-Na)=10-72=1.5
D. O2(8+8=16)=σ1s2, σ*1s2, σ2s2, σ*2s2, σ2pz2, π2px2π2py2, π*2px1π*2py1
Bond order=12(Nb-Na)=10-62=2