Which from following complexes is heteroleptic?

Which from following complexes is heteroleptic?
  1. $\mathrm{K}_3\left[\mathrm{Al}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]$
  2. $\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$
  3. $\mathrm{Na}_3\left[\mathrm{AlF}_6\right]$
  4. $\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)\left(\mathrm{NH}_3\right)_5\right] \mathrm{I}_3$

Solution

Complexes in which metal ion is surrounded by more than one type of ligands are heteroleptic. Among the given complexes, option (D) is a heteroleptic complex.

Asked in: MHT CET 2023 (10 May Shift 2)

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