Ncert Exercises & Solutions

Which of the following complex is/are homoleptic:

a.	$ {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}} $	b.	$ {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right]^{2+}} $
c.	$ {\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}}$	d.	$\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]$

Choose the correct option.
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)

Homoleptic complex: The complex containing only one type of species or group as ligands is known as a homoleptic complex.

e.g., ${[Co {({NH}_{3})}_{6}]}^{3 +}$ , ${[Ni {(CN)}_{4}]}^{2 -}$

Here, ${[C o {(N H_{3})}_{6}]}^{3 +}$ contains only ${N H}_{3}$ as a ligand and ${[N i {(C N)}_{4}]}^{2 -}$ contains CN as a ligand.

While the other two complexes ${[Co {({NH}_{3})}_{5} Cl]}^{2 +}$ and $[Ni {({NH}_{3})}_{4} {Cl}_{2}]$ contain NH₃and Cl as ligands.

Hence, 4th is the correct option.

a.	\( {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}} \)	b.	\( {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right]^{2+}} \)
c.	\( {\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}}\)	d.	\(\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]\)