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

Options

A. `Be_(2)` is not a stable molecule
B. `He_(2)` is not stable but `He_(2) ^(+)` is expected to exist
C. Bond strength of `N_(2)` is maximum amongst to homonuclear diatomic molecular belonging to the second period
D. The order of energies of molecular orbitals in `N_(2)` molecule is ` sigma 2slt sigma^(**) 2s lt sigma 2p_(z) lt (pi 2p_(x) = pi 2p_(y))` `lt (pi^(**) 2p_(x) = pi^(**) 2p_(y)) lt sigma^(**) 2p_(z)`

Answer

D

Explanation

The correct order of energies of molecular orbitals in `N_(2)` molecule is
`sigma _(2s) lt sigma_(2s)^(**) lt (pi_(2_(p_(x))) = pi_(2_(p_(y)))) lt sigma _(2_(p_(z)))lt (pi_(2_(p_(x)))^(**) = pi_(2_(p_(y)))^(**)) lt sigma_(2_(p_(z)))^(**)`