Using MOT, which of the following pairs denote paramagnetic species?

Options

A. `B_(2) and C _(2)`
B. `B _(2) and O _(2)`
C. `N _(2) and C _(2)`
D. `O _(2) and O _(2) ^(2-)`

Answer

B

Explanation

Among given four pairs, `B _(2) and O _(2)` are paramagnetic due to presence of unpaired electron.
`MO (EC) of B _(2) = sigma 1 s ^(2) sigma ^(**) 1 s ^(2) pi 2p _(2) ^(1) -= pi 2 p _(y) ^(1)`
`MO (EC) of O _(2) = sigma 1 s ^(2) sigma ^(**) 1s ^(2) sigma 2s ^(2)sigma ^(**) 2s ^(2) sigma 2 p _(2) pi 2p _(x) ^(2) -= pi 2p _(y) ^(2) pi ^(**) 2 p _(x) ^(1) -= pi 2 p _(y) ^(1)`