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The type of isomerism shown by the complex $[CoCl_2(en)_2]$ is
Explanation
$[MA_2(AA)_2]$ octahedral complexes show cis–trans isomerism.
Detailed Solution
In $[CoCl_2(en)_2]$, the coordination number of Co is 6 and the compound has octahedral geometry.
[add image: cis and trans isomers of $[CoCl_2(en)_2]$]
Among the given options, the type of isomerism shown is geometrical isomerism.