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

The correct option is C $B_2$

The electronic configuration of $B_2$ is

$\left(\sigma 1s^2\right)(\sigma \ast 1s^2)\left(\sigma 2s^2\right)(\sigma \ast 2s^2)(\pi 2p_x^1=\pi 2p_y^1)$

From here it is clear that $B_2$ two unpaired electrons so it will show paramegnatism.

So the correct option is [C]