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In which of the following processes , the bond order has increased and paramagnetic charecter has changed to diamagnetic ?
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Bond Order -
Bond order is defined as one half the difference between the number of electrons present in the bonding and the antibonding 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
Using the bond order and unpaired electrons
Option 1)

Option 2)
Option 3)
Option 4)