Which of the following species exhibits the diamagnetic behaviour ?

Options

A. NO
B. `O_(2)^(2-)`
C. `O_(2)^(+)`
D. `O_(2)`

Answer

B

Explanation

Diamagnetic species have no unpaired electrons `O_(2)^(2-) rArr sigma 1s^(2), sigma***1s^(2), sigma 2s^(2), sigma***2s^(2), sigma2p_(x)^(2), {pi 2p_(y)^(2)=pi 2p_(z)^(2), {pi ***2p_(y)^(2)=pi *** 2p_(z)^(2)`
Whereas paramagnetic species has one or more unpaired electrons as in
`O_(2) to sigma1s^(2), sigma***1s^(2), sigma2s^(2), sigma***2s^(2), sigma2p_(x)^(2), {pi 2p_(y)^(2)=pi2p_(z)^(2), { pi ***2p_(y)^(1)=pi ***2p_(z)^(1)-2` unpaired electrons
`O_(2)^(+) to sigma1s^(2), sigma***1s^(2), sigma2s^(2), sigma***2s^(2), sigma2p_(x)^(2), {pi 2p_(y)^(2)=pi2p_(z)^(2), { pi ***2p_(y)^(1)=pi ***2p_(z)^(0)-1` unpaired electron
`NO to sigma1s^(2), sigma***1s^(2), sigma2s^(2), sigma***2s^(2), sigma2p_(x)^(2), {pi 2p_(y)^(2)=pi2p_(z)^(2), { pi ***2p_(y)^(1)=pi ***2p_(z)^(0)-1` unpaired electron