Question

Which of the following complexes) is/are an example of homoleptic complex ?

• A. [Co(NH${}_3$)${}_6$]${}^{3+}$
• B. [Cr(H${}_2$O)${}_6$]${}^{3+}$
• C. [Ni(NH${}_3$)${}_6$]${}^{2+}$
• D. [Ni(NH${}_3$)${}_4$Cl${}_2$]

Answer 1

Answer: (A), (B), (C)

The correct options are
A [Co(NH${}_3$)${}_6$]${}^{3+}$
B [Cr(H${}_2$O)${}_6$]${}^{3+}$
C [Ni(NH${}_3$)${}_6$]${}^{2+}$

Homoleptic Complexes are compounds in which all the ligands bound to the metal center are identical.
[Co(NH${}_3$)${}_6$]${}^{3+}$,[Cr(H${}_2$O)${}_6$]${}^{3+}$ and [Ni(NH${}_3$)${}_6$]${}^{2+}$ consists of only one ligand(identical) so all these are Homoleptic Complexes.
But [Ni(NH${}_3$)${}_4$Cl${}_2$] consists of Cl and $N{H}_3$ (two) ligands.
Hence options A,B &C are correct.