The isomer(s) of that has/have a Cl–Co–Cl angle of 90°, is/are:

Question

The isomer(s) of  that has/have a Cl–Co–Cl angle of 90°, is/are:

Canvas Classes · Accepted Answer

Strategy:
 Differentiate between cis and trans arrangements regarding the angle between identical ligands.

Step 1: Define the geometries
The complex  is an octahedral complex of type .
- In the trans-isomer, the two  ligands are positioned on opposite vertices of the octahedron. The angle between them is exactly .
- In the cis-isomer, the two  ligands occupy adjacent vertices on the octahedron. Because the octahedral axes are orthogonal, the angle between them is exactly .

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