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

Explanation

(A-53), (B-4), (C-1), (D-2)
A) NO(7+8=15) =`sigma1s^(2), sigma^(star)1s^(2), sigma2s^(2), sigma^(star)2s^(2), sigma2p_(z)^(2), pi2p_(x)^(2)=pi2p_(y)^(2), pi^(star)2p_(x)^(1)`
Bond order =`1/2(N_(b)- N_(a)) = (10-5)/2= 2./5`
B) CO (6+8=14)`=sigma1s^(2), sigma^(star)1s^(2), sigma2s^(2), sigma2p_(z)^(2), pi2p_(x)^(2)=pi2p_(y)^(2)`
Bond order = `(10-4)/2=3`
C) `O_(2)^(-)(8+8+1=17)= sigma1s^(2), sigma^(star)1s^(2), sigma2s^(2), sigma^(star)2s^(2), sigma2p_(z)^(2), pi2p_(z)^(2), pi2p_(x)^(2)=pi2p_(y)^(2), pi^(star)2p_(x)^(2)~~ pi^(star)2p_(y)^(1)`
Bond order = `(10-7)/2=15`
D) `O_(2)(8+8=16)=sigma1s^(2), sigma^(star)1s^(2), sigma2s^(2), sigma^(star)2s^(2), sigma2p_(z)^(2), pi2p_(x)^(2)=pi2p_(y)^(2), pi^(star)2p_(x)^(1)~~ pi^(star)2p_(y)^(1)`
Bond order =`(10-6)/2=2`