A complex of the type `[M(A A)_(2)X_(2)]` is known to the optically active. What does this indicate about the structure of the complex? Give one example of such complex .

Explanation

An optically active complex of the type `[M(A A)_(2)X_(2)]^(n+)` indicates cis-octahedral structure, e.g., cis-`[Pt(en)_(2)Cl_(2)]^(2+)` or cis-`[Cr(en)_(2)Cl_(2)]^(+)` because its mirror image isomers are non-superimposable.

Non-superimposable isomers of `[Pt(en)_(2)Cl_(2)]^(2+)`.