Chemistry - CHEMICAL BONDING Question with Solution | TestHub

Gerade Molecular orbital: $\sigma$, ${\pi }^{\ast }$, $\delta$

$$\begin{array}{rl}& {\mathrm{B}}_2:\sigma 1{\mathrm{s}}^2,{\sigma }^{\ast }1{\mathrm{s}}^2,\sigma 2{\mathrm{s}}^2,{\sigma }^{\ast }2{\mathrm{s}}^2,\pi 2{\mathrm{p}}_{\mathrm{y}}^1=\pi 2{\mathrm{p}}_{\mathrm{z}}^1\\ & {\mathrm{C}}_2:\sigma 1{\mathrm{s}}^2,{\sigma }^{\ast }1{\mathrm{s}}^2,\sigma 2{\mathrm{s}}^2,{\sigma }^{\ast }2{\mathrm{s}}^2,\pi 2{\mathrm{p}}_{\mathrm{y}}^2=\pi 2{\mathrm{p}}_{\mathrm{z}}^2\\ & {\mathrm{N}}_2:\sigma 1{\mathrm{s}}^2,{\sigma }^{\ast }1{\mathrm{s}}^2,\sigma 2{\mathrm{s}}^2,{\sigma }^{\ast }2{\mathrm{s}}^2,\pi 2{\mathrm{p}}_{\mathrm{y}}^2=\pi 2{\mathrm{p}}_{\mathrm{y}}^2,\sigma 2{\mathrm{p}}_{\mathrm{x}}^2\\ & {\mathrm{N}}_2^{2+}:\sigma 1{\mathrm{s}}^2,{\sigma }^{\ast }1{\mathrm{s}}^2,\sigma 2{\mathrm{s}}^2,{\sigma }^{\ast }2{\mathrm{s}}^2,\pi 2{\mathrm{p}}_{\mathrm{y}}^2=\pi 2{\mathrm{p}}_{\mathrm{z}}^2\\ & {\mathrm{N}}_2^{2-}:\sigma 1{\mathrm{s}}^2,{\sigma }^{\ast }1{\mathrm{s}}^2,\sigma 2{\mathrm{s}}^2,{\sigma }^{\ast }2{\mathrm{s}}^2,\pi 2{\mathrm{p}}_{\mathrm{y}}^2=\pi 2{\mathrm{p}}_{\mathrm{y}}^2,\sigma 2{\mathrm{p}}_{\mathrm{x}}^2,{\pi }^{\ast }2{\mathrm{p}}_{\mathrm{y}}^1={\pi }^{\ast }2{\mathrm{p}}_{\mathrm{z}}^1\\ & {\mathrm{O}}_2:\sigma 1{\mathrm{s}}^2,{\sigma }^{\ast }1{\mathrm{s}}^2,\sigma 2{\mathrm{s}}^2,{\sigma }^{\ast }2{\mathrm{s}}^2,\sigma 2{\mathrm{p}}_{\mathrm{x}}^2,\pi 2{\mathrm{p}}_{\mathrm{y}}^2=\pi 2{\mathrm{p}}_{\mathrm{z}}^2,{\pi }^{\ast }2{\mathrm{p}}_{\mathrm{y}}^1={\pi }^{\ast }2{\mathrm{p}}_{\mathrm{z}}^1\\ & {\mathrm{O}}_2^{2-}:\sigma 1{\mathrm{s}}^2,{\sigma }^{\ast }1{\mathrm{s}}^2,\sigma 2{\mathrm{s}}^2,{\sigma }^{\ast }2{\mathrm{s}}^2,\sigma {\mathrm{p}}_{\mathrm{x}}^2,\pi 2{\mathrm{p}}_{\mathrm{y}}^2=\pi 2{\mathrm{p}}_{\mathrm{z}}^2,{\pi }^{\ast }2{\mathrm{p}}_{\mathrm{y}}^2={\pi }^{\ast }2{\mathrm{p}}_{\mathrm{z}}^2\end{array}$$

Gerade molecular orbitals are $\sigma$ and ${\pi }^{\ast }$.

So, the answer is ${\mathrm{N}}_2$, ${\mathrm{N}}_2^{2-}$, ${\mathrm{O}}_2$, ${\mathrm{O}}_2^{2-}$.