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As we learnt in
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
Electronic configuration of
molecule
Since there are 2 unpaired electrons in
&
degenerate orbitals, so,
is paramagnetic.
Similarly, for
molecule, we have
Since, there is 1 unpaired electron in
orbital,
Option 1)
This option is incorrect.
Option 2)
This option is incorrect.
Option 3)
This option is correct.
Option 4)
This option is incorrect.