JEE MAIN - Chemistry (2023 - 13th April Morning Shift - No. 1)
In which of the following processes, the bond order increases and paramagnetic character changes to diamagnetic one ?
$$\mathrm{O}_{2} \rightarrow \mathrm{O}_{2}^{2-}$$
$$\mathrm{N}_{2} \rightarrow \mathrm{N}_{2}^{+}$$
$$\mathrm{NO} \rightarrow \mathrm{NO}^{+}$$
$$\mathrm{O}_{2} \rightarrow \mathrm{O}_{2}^{+}$$
Explanation
Let's analyze each option:
Option A: $\mathrm{O}_{2} \rightarrow \mathrm{O}_{2}^{2-}$
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: $\mathrm{N}_{2} \rightarrow \mathrm{N}_{2}^{+}$
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: $\mathrm{NO} \rightarrow \mathrm{NO}^{+}$
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: $\mathrm{O}_{2} \rightarrow \mathrm{O}_{2}^{+}$
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 $\mathrm{NO} \rightarrow \mathrm{NO}^{+}$.
Option A: $\mathrm{O}_{2} \rightarrow \mathrm{O}_{2}^{2-}$
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: $\mathrm{N}_{2} \rightarrow \mathrm{N}_{2}^{+}$
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: $\mathrm{NO} \rightarrow \mathrm{NO}^{+}$
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: $\mathrm{O}_{2} \rightarrow \mathrm{O}_{2}^{+}$
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 $\mathrm{NO} \rightarrow \mathrm{NO}^{+}$.
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