Which of the following species have one unpaired electron each

Options

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

Answer

C

Explanation

`O_(2)^(-):(sigma1s^(2))(sigma^(**)1s^(2))(sigma2s^(2))(sigma^(**)2s^(2))(sigma2p_(z)^(2))(pi 2p_(x)^(2)=pi2p_(y)^(2))(pi^(**)2p_(x)^(2)=pi^(**)2p_(y)^(1))`
` N_(2),F_(2) and O_(2)^(2-) `have paired electrons.