Which of the following is an example of homoleptic complex?

Coordination Compounds PYQ — JEE Main 2016 · 10 Apr · Shift 1 · Q10 with Solution

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Correct answer: A

A homoleptic complex is a coordination compound in which the central metal ion is bonded to only one type of ligand.

Option A: $[Co(NH_3)_6]Cl_3$
- Coordination entity: $[Co(NH_3)_6]^{3+}$
- Ligands attached to Co: only $NH_3$
- Since there is only one kind of ligand in the coordination sphere, this is homoleptic.
Option B: $[Pt(NH_3)_2Cl_2]$
- Ligands attached to Pt: $NH_3$ and $Cl^-$
- Two different ligands are present, so this is heteroleptic.
Option C: $[Co(NH_3)_4Cl_2]$
- Ligands attached to Co: $NH_3$ and $Cl^-$
- Two different ligands are present, so this is heteroleptic.
Option D: $[Co(NH_3)_5Cl]Cl_2$
- Coordination entity: $[Co(NH_3)_5Cl]^{2+}$
- Ligands attached to Co: $NH_3$ and $Cl^-$
- Two different ligands are present, so this is heteroleptic.

Only Option A has a single type of ligand in the coordination sphere.

Therefore, the homoleptic complex is:

$\boxed{A}$