Question

In which of the following processes, the bond order has increased and paramagnetic character has changed to diamagnetic ?

• A. $N_2 \rightarrow N^{+}_2$
• B. $NO \rightarrow NO^{+}$
• C. $O_2 \rightarrow O_2^{2-}$
• D. $O_2 \rightarrow O_2^{+}$

Answer 1

Answer: (B)

Process	Change in magnetic nature	Bond Order Change
$N_2 \rightarrow N^{+}_2$	Dia $\to$ para	$ 3 \to 2.5 $
$NO \rightarrow NO^{+}$	Para $\to$ Dia	$ 2.5 \to 3 $
$O_2 \rightarrow O^{-2}_2$	Para $\to$ Dia	$2 \to 1$
$O_2 \rightarrow O^{+}_2$	Para $\to$ Para	$ 2 \to 2.5 $