Coordination CompoundsNEET Chemistry · Class 12 · NCERT Chapter 5

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• The naming rule: ligands first (alphabetical), then metal with oxidation state. If the complex is an anion, the metal name gets "-ate".
• Card 5 ([Cu(en)₂]²⁺) uses "bis()" not "di-" because "en" is a complex ligand name. Remember: bi/bis for complex names.
• Card 9 ([Pt(NH₃)₂Cl₂]) is cisplatin (cis form) — a famous anticancer drug. The naming itself is a frequent NEET question.

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• d⁶ octahedral is the most tested case: weak field gives 4 unpaired (high spin, Fe²⁺ with H₂O); strong field gives 0 unpaired (low spin, Fe²⁺ with CN⁻).
• Tetrahedral complexes are almost always high spin because Δt = 4/9 Δo is too small to overcome pairing energy.
• CFSE is maximum for d³ and d⁸ (octahedral). This explains why Cr³⁺ and Ni²⁺ form very stable octahedral complexes.