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Q.
Which of the following order of energies of molecular orbitals of $N_2$ is correct?
Chemical Bonding and Molecular Structure
Solution:
For molecules such as $B_2, C_2, N_2$ etc. the increasing order of energies of various molecular orbitals is
$\sigma 1s < \sigma^* 1s < \sigma 2s < \sigma^* 2s <\left(\pi 2p_{x}=\pi 2p_{y}\right) < \sigma 2p_{z} < $
$ \left(\pi^* 2p_{x} = \pi^* 2p_{y}\right) < \sigma^* 2p_{z}$