JEE Main 2023 — Chemical Bonding And Molecular Structure Question with Solution

Let's analyze each option:

Option A: ${\mathrm{O}}_2\to {\mathrm{O}}_2^{2-}$

The bond order of ${\mathrm{O}}_2$ is 2 and it is paramagnetic. When two electrons are added to form ${\mathrm{O}}_2^{2-}$, the bond order becomes 1 (decreases) and it becomes diamagnetic. This option does not meet the required conditions.

Option B: ${\mathrm{N}}_2\to {\mathrm{N}}_2^{+}$

The bond order of ${\mathrm{N}}_2$ is 3 and it is diamagnetic. When one electron is removed to form ${\mathrm{N}}_2^{+}$, the bond order becomes 2.5 (decreases) and it remains diamagnetic. This option does not meet the required conditions.

Option C: $\mathrm{NO}\to {\mathrm{NO}}^{+}$

The bond order of $\mathrm{NO}$ is 2.5 and it is paramagnetic. When one electron is removed to form ${\mathrm{NO}}^{+}$, the bond order becomes 3 (increases) and it becomes diamagnetic. This option meets the required conditions.

Option D: ${\mathrm{O}}_2\to {\mathrm{O}}_2^{+}$

The bond order of ${\mathrm{O}}_2$ is 2 and it is paramagnetic. When one electron is removed to form ${\mathrm{O}}_2^{+}$, the bond order becomes 2.5 (increases) and it remains paramagnetic. This option does not meet the required conditions.

Therefore, the correct answer is $\mathrm{NO}\to {\mathrm{NO}}^{+}$.