Question

Discuss Werner's theory of coordination compounds.

Hint:

Werner’s theory explains the geometry of coordination complexes, distinguishing between oxidation state and coordination number.

Answer 1

Step 1: Main Postulates of Werner’s Theory: 1. Metals exhibit primary valency (oxidation state) and secondary valency (coordination number).
2. Secondary valency is directed towards specific ligands in a fixed geometry.
3. Example: In \([Co(NH_3)_6]Cl_3\), Co has:
- Primary valency: +3 (satisfied by Cl\(^-\))
- Secondary valency: 6 (satisfied by NH\(_3\))