EAN Rule, 18 & 16 Electron Rule Organometallic Chem Lecture 2 | B.Sc. 5th Sem | Prof. Shivam Kapri

📋 YouTube Description Welcome to Lecture 2 of Organometallic Chemistry, B.Sc. 5th Semester Inorganic Chemistry, with Prof. Shivam Kapri. This lecture covers electron counting rules and the complete study of metal carbonyls: structure, formation and chemical properties. What's covered in this lecture: ✅ Total Valence Electron Count (VEC): neutral and ionic methods, with solved examples such as [PtCl₃(η²-C₂H₄)]⁻, [Cr(η⁶-C₆H₆)₂] and [Cu(NH₃)₄]⁺ ✅ EAN (Effective Atomic Number) Rule: formula and solved examples for Fe₂(CO)₉ and Co₂(CO)₈ ✅ 18 Electron Rule and 16 Electron Rule: why 18, why square planar d⁸ complexes prefer 16, with examples ✅ Structure of Metal Carbonyls (VBT): Structure of the CO ligand by VBT and MOT (bond order 3) σ bonding and π back bonding (synergic effect) [Ni(CO)₄]: sp³, tetrahedral [Fe(CO)₅]: dsp³, trigonal bipyramidal Bridging CO structure: Fe₂(CO)₉ and Co₂(CO)₈ ✅ Method of Formation: direct addition of CO, metal halides, decomposition of metal carbonyls, metal oxides ✅ Chemical Properties: substitution reaction, carbonyl halide formation, carbonyl hydride formation, thermal decomposition Most important concept of this lecture: Count the electrons first. Once VEC and EAN are clear, the 18 electron rule and the stability and structure of every metal carbonyl become easy to predict. Who is this lecture for: B.Sc. 5th Semester Chemistry students Students preparing for M.Sc. entrance exams (IIT JAM, CUCET, BHU) Anyone who finds electron counting or metal carbonyls difficult 📌 Watch Lecture 1 (Metal Carbonyl: structure via VBT & MOT) first if you have not. 🎓 Prof. Shivam Kapri: making Inorganic Chemistry clear, deep and exam-ready. 🔔 Subscribe and hit the bell icon. The full B.Sc. 5th Sem series is uploading chapter by chapter. 💬 Drop your doubts in the comments.