Which one of the following molecules is expected to exhibit paramagnetic behaviour?

Question

Aicharya · Accepted Answer

$O_2 = \sigma_1s^2 < \sigma^*_1s^2 < \sigma_2s^2 < \sigma^*_2s^2 < \sigma_2p_z^2 < \pi_2p_y^2 = \pi_2p_x^2 < \pi^*_2p_y^1 = \pi^*_2p_x^1$ Paramagnetic $O_2^{-2} = \sigma_1s^2 < \sigma^*_1s^2 < \sigma_2s^2 < \sigma^*_2s^2 < \sigma_2p_z^2 < \pi_2p_y^2 = \pi_2p_x^2 < \pi^*_2p_y^2 = \pi^*_2p_x^2$ Diamagnetic $C_2 = \sigma_1s^2 < \sigma^*_1s^2 < \sigma_2s^2 < \sigma^*_2s^2 < \pi_2p_x^2 = \pi_2p_y^2$ Diamagnetic $N_2 = \sigma_1s^2 < \sigma^*_1s^2 < \sigma_2s^2 < \sigma^*_2s^2 < \pi_2p_x^2 = \pi_2p_y^2 < \sigma_2p_z^2$ Diamagnetic $O_2$ has unpaired $e^-$ so it is paramagnetic.

Which one of the following molecules is expected to exhibit paramagnetic behaviour?

Solution