Physical · Hückel MO Theory
Hückel Molecular Orbital Theory (HMO)
Exam-focused revision notes on Hückel Molecular Orbital Theory (HMO) for CSIR-NET Chemical Sciences, GATE Chemistry and IIT-JAM — the core concepts, the formulas worth memorising, the traps that cost marks, and a quick-recall table.
Purpose
A simple, approximate MO method for the π systems of planar conjugated and aromatic molecules. It gives π-orbital energies, the ordering of MOs, and delocalization energy — enough to explain aromatic stability without a full calculation.
What this note covers
- 1Purpose
- 2The Hückel assumptions
- 3Secular determinant
- 4Results — the standard systems
- 5HOMO, LUMO & frontier orbitals
- 6Common traps students miss
- 730-second recall table
Read the full note
The remaining 6 sections — including the worked examples, the common-traps list and the quick-recall table — are part of ChemVidya Full Access, along with 6,000+ practice questions.
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