Question

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

• 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 the homonuclear diatomic molecules belonging to the second period.
• D. The order of energies of molecular orbitals in $N_{2}$molecule is $\sigma 2s < \sigma*2s < \sigma 2p_{z} < (\pi 2p_{x} = \pi 2p_{y})$ $< (\pi*2p_{x} = \pi*2p_{y}) < \sigma*2p_{z}$

Answer 1

Answer: (D)

The order of energies of molecular orbitals in $N_{2}$molecule is $\sigma 2s < \sigma*2s < \sigma 2p_{z} < (\pi 2p_{x} = \pi 2p_{y})$

$< (\pi*2p_{x} = \pi*2p_{y}) < \sigma*2p_{z}$

Answer 2

: The correct order of energies of molecular orbitals in $N_{2}$molecule is

$\sigma 2s < \sigma*2s < (\pi 2p_{x} = \pi 2p_{y}) < \sigma 2p_{z} < (\pi*2p_{x} = \pi*2py) < \sigma*2P_{z}$