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$\sigma \,\,1{s^2}\,\,{\sigma ^*}\,\,1{s^2}\,\sigma \,\,2{s^2}\,{\sigma ^*}\,2{s^2}\,\,\sigma \,2p_x^2\,\left\{ {{}_{\pi \,2p_z^2}^{\pi \,2p_y^2}} \right.$
Its bond order is
$(II)\, O^+_2 ,NO,N^-_2$ have same bond order of $2 \frac{1}{2}$
$(III)$ Bond order can assume any value including zero upto four
$(IV)\, NO^-_3$ and $BO^-_3$ have same bond order for $X - O$ bond (where $X$ is central atom)
$AB , A _2$ and $B _2$ are diatomic molecule. If the bond enthalpies of $A _2, B _2$ and $AB$ are in the ratio $1: 0.5: 1$, then the bond enthalpy of $A_2$ is $......\,kJ\,mol ^{-1}$ (Nearest integer)