Which of the following statement is not correct form the view point of molecular orbital theory?

• A

  Be₂ is not a stable molecule

• B

  He₂ is not stable but ${\mathrm{He}}_2^{+}$ it expected to exist

• C

  Bond strength of N₂ is maximum amongst the homonuclear diatomic molecules belonging to the second period

• D

  The order of energies of molecular orbitals in N₂ molecule is
   $\begin{array}{r}\mathrm{\sigma }2\mathrm{s}<{\mathrm{\sigma }}^{\ast }2\mathrm{s}<\mathrm{\sigma }2{\mathrm{p}}_{\mathrm{z}}<(\left.\mathrm{\pi }2{\mathrm{p}}_{\mathrm{x}}\approx \mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}\right)\\ <\left({\mathrm{\pi }}^{*}2{\mathrm{p}}_{\mathrm{x}}\approx {\mathrm{\pi }}^{*}2{\mathrm{p}}_{\mathrm{y}}\right)<{\sigma }^{*}2{\mathrm{p}}_{\mathrm{z}}\end{array}$