Orbitals of equal energy are called degenerated orbitals. Homonuclear molecules are the molecules composed of only one type of element and contain following set of degenerated orbitals:

As, energy of,

 $\mathrm{\sigma }2\mathrm{s}>\mathrm{\sigma }1\mathrm{s}$

$\mathrm{\pi }2{\mathrm{p}}_{\mathrm{x}}\approx 2{\mathrm{p}}_{\mathrm{y}}$

${\mathrm{\pi }}^{*}2{\mathrm{p}}_{\mathrm{x}}<{\mathrm{\sigma }}^{*}2{\mathrm{p}}_{\mathrm{z}}$

$\mathrm{\sigma }2{\mathrm{p}}_{\mathrm{x}}<{\mathrm{\sigma }}^{*}2{\mathrm{p}}_{\mathrm{z}}$

Thus, only $\mathrm{\pi }2{\mathrm{p}}_{\mathrm{x}}$ and $\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}$ are degenerate orbitals.