Which among the following cations forms a least stable complex if the ligand is same?

Which among the following cations forms a least stable complex if the ligand is same?
  1. $\mathrm{Cd}^{2+}$
  2. $\mathrm{Co}^{2+}$
  3. $\mathrm{Ni}^{2+}$
  4. $\mathrm{Fe}^{2+}$

Solution

$\mathrm{Cd}^{2+}$ has large size and fully filled d-orbitals therefore leads to less stable bonding.

Asked in: MHT CET 2022 (05 Aug Shift 2)

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