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 "O_(2)`
D. `O_(2)" and "O_(2)^(2-)`

Explanation

(b) Among given four pairs, `B_(2)"and"O_(2)` are paramagnetic due to presence of unpaired electron. MO electronic configuration of `B_(2)=sigma1s^(2)overset(star)sigma1s^(2)sigma2s^(2)overset(star)sigma2s^(2)pi2p_(2)^(1)equivpi2p_(y)^(1)`
MO electronic configuration of `O_(2)=sigma1s^(2)overset(star)sigma1s^(2)sigma2s^(2)overset(star)sigma2s^(2)sigma2p_(2)^(2)`
`pi2p_(x)^(2)equivpi2p_(y)^(2)overset(star)pi2p_(x)^(1)equivpi2p_(y)^(1)`