The correct order of energies of molecular orbitals of N₂ molecule, is

$\mathrm{\sigma }\text{ Is }<{\mathrm{\sigma }}^{\ast }\text{ 1s }<\mathrm{\sigma }2\mathrm{s}<{\mathrm{\sigma }}^{\ast }2\mathrm{s}<\left(\mathrm{\pi }2{\mathrm{p}}_{\mathrm{x}}=\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}\right)<\left({\mathrm{\pi }}^{\ast }2{\mathrm{p}}_{\mathrm{x}}={\mathrm{\pi }}^{\ast }2{\mathrm{p}}_{\mathrm{y}}\right)<\mathrm{\sigma }2{\mathrm{p}}_{\mathrm{z}}<{\mathrm{\sigma }}^{\ast }2{\mathrm{p}}_{\mathrm{z}}$

$\mathrm{\sigma }\text{ ls }<{\mathrm{\sigma }}^{\ast }\text{ 1s }<\mathrm{\sigma }2\mathrm{s}<{\mathrm{\sigma }}^{\ast }2\mathrm{s}<\mathrm{\sigma }2{\mathrm{p}}_{\mathrm{z}}<\left(\mathrm{\pi }2{\mathrm{p}}_{\mathrm{x}}=\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}\right)<\left({\mathrm{\pi }}^{\ast }2{\mathrm{p}}_{\mathrm{x}}={\mathrm{\pi }}^{\ast }2{\mathrm{p}}_{\mathrm{y}}\right)<{\mathrm{\sigma }}^{\ast }2{\mathrm{p}}_{\mathrm{z}}$

$\mathrm{\sigma }\text{ ls }<{\mathrm{\sigma }}^{\ast }\text{ 1s }<\mathrm{\sigma }2\mathrm{s}<{\mathrm{\sigma }}^{\ast }2\text{ s }<\left(\mathrm{\pi }2{\mathrm{p}}_{\mathrm{x}}=\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}\right)<\mathrm{\sigma }2{\mathrm{p}}_{\mathrm{z}}<\left({\mathrm{\pi }}^{\ast }2{\mathrm{p}}_{\mathrm{x}}={\mathrm{\pi }}^{\ast }2{\mathrm{p}}_{\mathrm{y}}\right)<{\mathrm{\sigma }}^{\ast }2{\mathrm{p}}_{\mathrm{z}}$

$\mathrm{\sigma }\text{ Is }<{\mathrm{\sigma }}^{\ast }\text{ 1s }<\mathrm{\sigma }2\mathrm{s}<{\mathrm{\sigma }}^{\ast }2\mathrm{s}<\mathrm{\sigma }2{\mathrm{p}}_{\mathrm{z}}<{\mathrm{\sigma }}^{\ast }2{\mathrm{p}}_{\mathrm{z}}<\left(\mathrm{\pi }2{\mathrm{p}}_{\mathrm{x}}=\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}\right)<\left({\mathrm{\pi }}^{\ast }2{\mathrm{p}}_{\mathrm{x}}={\mathrm{\pi }}^{\ast }2{\mathrm{p}}_{\mathrm{y}}\right)$