Which of the following molecules is paramagnetic?

Question

Which of the following molecules is paramagnetic? (A)  B2  (B)  H2  (C)  Li2  (D)  N2

Tardigrade Admin · Accepted Answer

B 3(10)=σ 1 s2, overset starσ 1 s2, σ 2 s2, overset starσ 2 s2, π 2 px1 ≈ π 2 py1 Since, two unpaired electrons are present, B2 is paramagnetic. All other species, due to the absence of unpaired electrons, are diamagnetic.

Q. Which of the following molecules is paramagnetic?

$B_{2}$

$H_{2}$

$L i_{2}$

$N_{2}$

$B_{3} (10) = σ 1 s^{2}, σ ⋆ 1 s^{2}, σ 2 s^{2}, σ ⋆ 2 s^{2}, π 2 p_{x}^{1} \approx π 2 p_{y}^{1}$
Since, two unpaired electrons are present, $B_{2}$ is paramagnetic.
All other species, due to the absence of unpaired electrons, are diamagnetic.