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Energy level diagram for molecular orbitals. -
1S atomic orbitals combine to give
and 
2S and 2P atomic orbitals give rise to eight molecular orbitals.
- wherein
Magnetic behaviour of molecule -
If all the molecular orbitals in a molecule are doubly occupied, the substance is diamagnetic
- wherein
However if one or more molecular orbital are singly occupied it is paramagnetic e.g. O2
If the molecular orbitals have unpaired electrons then the molecule will paramagnetic.
or if all are paired then the molecule will diamagnetic.
In CO, moleculer orbital configuration
There are no unpaired electrons.
Option 1)
Option 2)
Option 3)
Option 4)