The molecular orbital diagram for the \(\mathrm{C}_2^{2-}\) ion would show which of the following molecular orbitals?
1
\(\left(\sigma_{1 \mathrm{~s}}\right)^2\left(\sigma_{1 \mathrm{~s}}^*\right)^2\left(\sigma_{2 \mathrm{~s}}\right)^2\left(\sigma_{2 \mathrm{~s}}^*\right)^2\left(\pi_{2 \mathrm{p}}\right)^4\)
2
\(\left(\sigma_{1 \mathrm{~s}}\right)^2\left(\sigma_{1 \mathrm{~s}}^*\right)^2\left(\sigma_{2 \mathrm{~s}}\right)^2\left(\sigma_{2 \mathrm{~s}}^*\right)^2\left(\pi_{2 \mathrm{p}}\right)^4\left(\sigma_{2 \mathrm{p}}\right)^4\)
3
\(\left(\sigma_{1 \mathrm{~s}}\right)^2\left(\sigma_{1 \mathrm{~s}}^*\right)^2\left(\sigma_{2 \mathrm{~s}}\right)^2\left(\sigma_{2 \mathrm{~s}}^*\right)^2\left(\pi_{2 \mathrm{p}}\right)^4\left(\sigma_{2 \mathrm{p}}\right)^2\)
4
\(\left(\sigma_{1 \mathrm{~s}}\right)^2\left(\sigma_{1 \mathrm{~s}}^*\right)^2\left(\sigma_{2 \mathrm{~s}}\right)^2\left(\sigma_{2 \mathrm{~s}}^*\right)^2\left(\sigma_{2 \mathrm{p}}\right)^2\left(\pi_{2 \mathrm{p}}\right)^3\)