Which of the following molecules /ions does not contain upaired electrons ?

Options

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

Answer

A

Explanation

`O_(2)^(2-)` (Number of electrons = 18 does not contain unpaired `e^(-))O_(2)^(2-)`
`= sigma1s^(2), sigma1s^(2), sigma2s^(2), sigma2s^(2) , sigma2p_(z)^(2), pi2p_(z)^(2) = pi2p_(y)^(2)`
`pi2p_(x)^(2) pi2p_(y)^(2)`