QCC Notes
CLASS 11 · CHEMISTRYJEE MAIN × NEETहिंदी
§ 4NCERT Class 11 · Chemistry · Chapter 4

Chapter 4: Chemical Bonding and Molecular Structure

The chapter every later chapter leans on: why atoms bond, how electrons arrange themselves into shapes, and what happens when electrons delocalise across whole molecules. Nine topics, nine live labs, twenty-seven solved examples — and one mastery test to certify you.

Topics in this chapter

  1. § 4.1 Kössel-Lewis Approach to Chemical BondingMaster the Kössel-Lewis approach for JEE & NEET — octet rule, Lewis symbols & structures, formal charges, exceptions & a live octet ledger.
  2. § 4.2 Ionic or Electrovalent Bond: Formation, Lattice Enthalpy & PropertiesMaster ionic bonding for JEE & NEET — electron transfer, lattice enthalpy, factors favouring ionic bonds, properties of ionic compounds & a live comparator.
  3. § 4.3 Bond Parameters: Length, Enthalpy, Order & ResonanceMaster bond parameters for JEE & NEET — bond length, angle, enthalpy, mean bond enthalpy, bond order effects, resonance & a live parameter bench.
  4. § 4.4 VSEPR Theory: Molecular Shapes, AXE Notation & GeometryMaster VSEPR theory for JEE & NEET — electron-pair repulsions, AXE notation, geometries vs shapes, bond-angle deviations & a live molecular shape predictor.
  5. § 4.5 Valence Bond Theory: Orbital Overlap, σ & π BondsMaster valence bond theory for JEE & NEET — orbital overlap, sigma and pi bonds, overlap strength, VBT's failures & a live overlap quality bench.
  6. § 4.6 Hybridisation: sp, sp², sp³ & Molecular ShapesMaster hybridisation for JEE & NEET — sp, sp², sp³, sp³d, sp³d² types, steric number method, shapes, examples & a live hybridisation solver.
  7. § 4.7 Molecular Orbital Theory: Bond Order & MagnetismMaster molecular orbital theory for JEE & NEET — LCAO, MO energy diagrams, bond order, paramagnetism of O2 & a live MO builder for 15 diatomic species.
  8. § 4.8 Bonding in Homonuclear Diatomic Molecules: H₂ to Ne₂Master bonding in homonuclear diatomic molecules for JEE & NEET — H2 to Ne2 MO configurations, the N2+/O2+ ionisation paradox & a live diatomic scoreboard.
  9. § 4.9 Hydrogen Bonding: The Bridge That Shapes WaterMaster hydrogen bonding for JEE & NEET — the X–H⋯Y bridge, inter and intramolecular types, water, HF and ice anomalies & a live hydrogen bond gallery.
  10. ✓ Chapter testAttempt all questions, then submit to see your score and the explanation for every answer.

Start the chapter →