The one that is not expected to show isomerism is:

Question

Canvas Classes · Accepted Answer

Strategy:
 Determine the capacity for geometrical or optical isomerism for each complex based on its geometry and coordination formula.

Step 1: Evaluate each molecule
- : Octahedral . Shows cis/trans isomerism.
- : Octahedral . Chiral, so it shows optical isomerism ( and ).
- :  (). Since both  and  are not immensely strong and nickel commonly favors tetrahedral forms with weak/moderate halides, a general  formulation is typically tetrahedral (). A tetrahedral molecule of type  has no cis/trans

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