Question

In which of the following ionization processes the bond energy increases and the magnetic behaviour changes from paramagnetic to diamagnetic :

• A. $O_2 \to O_2^+$
• B. $C_2 \to C_2^+$
• C. $NO \to NO^+$
• D. $N_2 \to N_2^+$

Answer 1

Answer: (C)

$NO \to NO^+$

Answer 2

A) Going from $N _{2}$ to $N _{2}^{+}$, bond order decreases from 3 to $2.5$.
B) Going from $C _{2}$ to $C _{2}^{+}$, bond order decreases from 2 to $1.5$.
C) Going from NO to NO', bond order increases from $2.5$ to 3 , and the magnetic behavior changes from paramagnetic to diamagnetic.
D) Going from $O _{2}$ to $O _{2}^{+}$, bond order increases from 2 to $2.5$, but magnetic behavior does not change. Both of these species are paramagnetic.