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

Explanation

In `[M(A A)_(2)X_(2)]` since `AA` is a bidentate (symmetrical) ligand and `X` is a monodentate ligand `CN` of `M` (central metal atom) is 6 and hence `[M(A A)_(2)X_(2)]` has octahedral geometry `[Co(en)_(2)CI_(2)]^(o+)` ion is an example of the above type complex This ion has cis and trans isomers (geometrical isomers) Since cis isomer is optically active it has d and l-isomers Since trans -isomer is symmetrical it is optically inactive and hence trans is meso form

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