write the increasing order of value is CFSE (delta O) for the following species

Dear Student
The value of CFSE depends on the ligand and the period in which central atom belongs.
In this the ligand is same in all three compounds.
However the central ion/atom is different.
As we go down a group the value of CFSE increases.
Iridium(Ir) belongs to group 5, Rhodium(Rh) belongs to group 4 and Cobalt(Co) belongs to group 3.
So the order increases as Ir>Rh>Co.
Hence III>II>I
so option 2 is correct.


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