The correct order of bond order values among the following is 
i) NO^– 
ii) NO⁺ 
iii) NO 
iv) NO⁺² 
v) NO^–2

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

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

$$\begin{gathered} \mathrm{NO}\left(15{\mathrm{e}}^{-}\right) : \mathrm{\sigma }1{\mathrm{s}}^2\mathrm{\sigma }*1{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{s}}^2\mathrm{\sigma }*2{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{p}}_{\mathrm{x}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{z}}^2\mathrm{\pi }*2{\mathrm{p}}_{\mathrm{y}}^1\mathrm{\pi }*2{\mathrm{p}}_{\mathrm{z}}^0 \\ \mathrm{B}.\mathrm{O}=\frac{10-5}{2}=2.5 \end{gathered}$$

$$\begin{gathered} {\mathrm{NO}}^{+2}\left(13{\mathrm{e}}^{-}\right) : \mathrm{\sigma }1{\mathrm{s}}^2\mathrm{\sigma }*1{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{s}}^2\mathrm{\sigma }*2{\mathrm{s}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{z}}^2\mathrm{\sigma }2{\mathrm{p}}_{\mathrm{x}}^1 \\ \mathrm{B}.\mathrm{O}=\frac{9-4}{2}=2.5 \end{gathered}$$

$$\begin{gathered} {\mathrm{NO}}^{-2}\left(17{\mathrm{e}}^{-}\right) : \mathrm{\sigma }1{\mathrm{s}}^2\mathrm{\sigma }*1{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{s}}^2\mathrm{\sigma }*2{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{p}}_{\mathrm{x}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{z}}^2\mathrm{\pi }*2{\mathrm{p}}_{\mathrm{y}}^2\mathrm{\pi }*2{\mathrm{p}}_{\mathrm{z}}^1 \\ \mathrm{B}.\mathrm{O}=\frac{10-7}{2}=1.5 \end{gathered}$$

Hence, the order of bond orders is, v < i < iv = iii < ii