Which of the following has unpaired electron(s)?

Options

A. `N_(2)`
B. `NO_(2)^(-)`
C. `N_(2)^(2+)`
D. `O_(2)^(2-)`

Answer

B

Explanation

`O_(2)^(-)(17)=KK sigma(2ps)^(2) sigma^(**) (2s^(2)) sigma(2p_(z))^(2)`
`pi(2p_(x))^(2)=pi (2p_(y))^(2)(pi^(**) 2p_(x))^(2)=(pi^(**) 2p_(y))^(1)`
One unparied electron- Paramagnetic.