Question

Which of the following molecules is paramagnetic in nature?

• A. $H_2$
• B. $L{i}_2$
• C. $B_2$
• D. $N_2$

Answer 1

Answer: (C)

$B_2$ molecule has the following configuration:
$\left(\sigma 1s^2\right)\left({\sigma }^{\ast }1s^2\right)\left(\sigma 2s^2\right)\left({\sigma }^{\ast }2s^2\right)\left(\pi 2p_x^1=\pi 2p_y^1\right)$