Q.
Among $(i)\, [Cr(en)_3]^{3+}$,
$(ii)$ trans - $[Cr(en)_2Cl_2]^+$,
$(iii)$ cis - $[Cr(en)_2Cl_2]^+$,
$ (iv) \,[CO(NH_3)_4Cl_2]^+$,
the optically active complexes are
KVPYKVPY 2017
Solution:
Optically active complexes are those complexes in which the mirror images are non-superimposable on each other. Complexes of type $[M(AA)_3]$, cis $[M(AA)_2B_2]$ are optically active. The type of complexes given follows :
Complexes
Types of complexes
$[Cr(en)_3]^{3+}$
$[M(AA)_3]$
trans- $[Cx (en)_2Cl_2]^+$
trans- $[M(AA)_2Cl_2]$
cis- $[Cr(en)_2Cl_2]^+$
cis- $[M(AA)_2Cl_2]$
$[Co (NH_3)_4Cl_2]^+$
$[MA_4B_2]$
Thus, among the given options $[Cr(en)_3]^{3+}$ and cis $[Cr(en)_2Cl_2]^+$ are optically active.
| Complexes | Types of complexes |
|---|---|
| $[Cr(en)_3]^{3+}$ | $[M(AA)_3]$ |
| trans- $[Cx (en)_2Cl_2]^+$ | trans- $[M(AA)_2Cl_2]$ |
| cis- $[Cr(en)_2Cl_2]^+$ | cis- $[M(AA)_2Cl_2]$ |
| $[Co (NH_3)_4Cl_2]^+$ | $[MA_4B_2]$ |