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🔗 Master Chemical Bonding & Molecular Structure
NCERT Class 11 · Chapter 4

Real PYQs from top competitive exams — filter by exam, attempt each question, track your progress and submit to see your full score report.

Attempt PYQs Study Strategy
VSEPRHybridisationMOTResonancePolarity
C H H O
50
Real PYQs
5
Exam Bodies
15+
Years Covered
~11%
Exam Weightage
PYQs Overview
🔷
VSEPR Theory & Geometry
Bond pairs, lone pairs, prediction of shapes — linear to octahedral.
★★★★★
93% Frequency
🌀
Hybridisation
sp, sp², sp³, sp³d, sp³d² — determine from formula, predict geometry.
★★★★★
89% Frequency
🔗
Ionic & Covalent Bonds
Lattice energy, Born-Haber cycle, Fajans' rules, covalent character.
★★★★☆
66% Frequency
🌊
Resonance & Formal Charge
Draw all resonance structures; minimise formal charge.
★★★★☆
74% Frequency
⚡
MOT (MO Theory)
Bond order = (Nb–Na)/2, O₂ paramagnetism, MO diagrams.
★★★★☆
81% Frequency
💧
Dipole Moment & Polarity
Vector addition of bond dipoles, symmetric cancellation.
★★★☆☆
58% Frequency
Topic Frequency
VSEPR & Molecular Geometry 93%
Hybridisation 89%
MOT & Bond Order 81%
Resonance & Formal Charge 74%
Fajans' Rules 66%
Dipole Moment 58%
Born-Haber Cycle 45%
💡 Did You Know?
  • VSEPR + hybridisation = 55% of chapter marks
  • MOT asked in every JEE Main since 2013
  • O₂ paramagnetism — asked 12× in 20 yrs
  • Bond order calculation — zero skips in 14 yrs
  • Chapter 4 = highest weightage in Unit 2
Key Takeaways
🔑
VSEPR: lone pairs repel more than bond pairs
LP–LP > LP–BP > BP–BP. Shapes distort accordingly.
⚡
Bond order from MO: (Nb – Na) / 2
BO=0 → molecule doesn't exist. Higher BO = shorter, stronger.
📐
O₂ has BO=2 and is paramagnetic
Two unpaired electrons in π* antibonding orbitals.
🌊
Resonance lowers energy, delocalises electrons
Actual structure = weighted average; bond lengths intermediate.
🧮
Formal charge = V – N – B/2
Choose structure with lowest FC and negative FC on electronegative atom.
🎯
Fajans': small cation + large anion → covalent
High charge density polarises the anion.
Study Strategy
1
Bonding BasicsDay 1–2
Ionic, covalent, metallic, coordinate, hydrogen bonds.
2
VSEPR + HybridisationDay 3
Master the lone-pair count algorithm. Draw every common molecule.
3
MOT DiagramsDay 4–5
B₂ to Ne₂ diatomics. Bond order and magnetism for each.
4
Attempt All PYQsDay 6–7
Focus on geometry prediction and MOT bond-order questions.
5
Mock & RevisionDay 8
30-Q timed; target shape and bond-order questions.
🗓️ 8-Day Chapter Plan
Day 1–2 Bonding Basics
Day 3 VSEPR + Hybridisation
Day 4–5 MOT Diagrams
Day 6–7 Attempt All PYQs
Day 8 Mock & Revision
🧠 Pro Tip: Hybridisation from formula alone (count σ bonds + lone pairs on central atom) solves 30% of questions.
🚀

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CHEMICAL BONDING AND MOLECULAR STRUCTURE – Learning Resources

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