In which pair, the stronger bond is found in the first species ? 
$$\begin{gathered} \mathrm{a}) {\mathrm{O}}_2^{-},{\mathrm{O}}_2 \\ \mathrm{b}) {\mathrm{N}}_2,{\mathrm{N}}_2^{+} \\ \mathrm{c}) {\mathrm{NO}}^{+},{\mathrm{NO}}^{-} \end{gathered}$$

Higher is the bond order, stronger is the bond formed.

$$\begin{gathered} {\mathrm{O}}_2^{-} : \mathrm{\sigma }1{\mathrm{s}}^2\mathrm{\sigma }*1{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{s}}^2\mathrm{\sigma }*2{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{p}}_{\mathrm{x}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{z}}^2\mathrm{\pi }*2{\mathrm{p}}_{\mathrm{y}}^2\mathrm{\pi }*2{\mathrm{p}}_{\mathrm{z}}^1 \\ \mathrm{B}.\mathrm{O}=\frac{10-7}{2}=1.5 \end{gathered}$$

$$\begin{gathered} {\mathrm{O}}_2\left(16{\mathrm{e}}^{-}\right) : \mathrm{\sigma }1{\mathrm{s}}^2\mathrm{\sigma }*1{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{s}}^2\mathrm{\sigma }*2{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{p}}_{\mathrm{x}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{z}}^2\mathrm{\pi }*2{\mathrm{p}}_{\mathrm{y}}^1\mathrm{\pi }*2{\mathrm{p}}_{\mathrm{z}}^1 \\ \mathrm{B}.\mathrm{O}=\frac{10-6}{2}=2 \end{gathered}$$

$$\begin{gathered} {\mathrm{N}}_2\left(14{\mathrm{e}}^{-}\right) : \mathrm{\sigma }1{\mathrm{s}}^2\mathrm{\sigma }*1{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{s}}^2\mathrm{\sigma }*2{\mathrm{s}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{z}}^2\mathrm{\sigma }2{\mathrm{p}}_{\mathrm{x}}^2 \\ \mathrm{B}.\mathrm{O}=\frac{10-4}{2}=3 \end{gathered}$$

$$\begin{gathered} {\mathrm{N}}_2^{+}\left(13{\mathrm{e}}^{-}\right) : \mathrm{\sigma }1{\mathrm{s}}^2\mathrm{\sigma }*1{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{s}}^2\mathrm{\sigma }*2{\mathrm{s}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{z}}^2\mathrm{\sigma }2{\mathrm{p}}_{\mathrm{x}}^1 \\ \mathrm{B}.\mathrm{O}=\frac{9-4}{2}=2.5 \end{gathered}$$

$$\begin{gathered} {\mathrm{NO}}^{+}\left(14{\mathrm{e}}^{-}\right) : \mathrm{\sigma }1{\mathrm{s}}^2\mathrm{\sigma }*1{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{s}}^2\mathrm{\sigma }*2{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{p}}_{\mathrm{x}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{z}}^2 \\ \mathrm{B}.\mathrm{O}=\frac{10-4}{2}=3 \end{gathered}$$

$$\begin{gathered} {\mathrm{NO}}^{-}\left(16{\mathrm{e}}^{-}\right) : \mathrm{\sigma }1{\mathrm{s}}^2\mathrm{\sigma }*1{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{s}}^2\mathrm{\sigma }*2{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{p}}_{\mathrm{x}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{z}}^2\mathrm{\pi }*2{\mathrm{p}}_{\mathrm{y}}^1\mathrm{\pi }*2{\mathrm{p}}_{\mathrm{z}}^1 \\ \mathrm{B}.\mathrm{O}=\frac{10-6}{2}=2 \end{gathered}$$