CBSE 11 Chemistry · U4

Chemical Bonding and Molecular Structure

CBSE Class 11 Chemistry Unit IV: Kossel-Lewis approach, ionic bond, bond parameters, VSEPR theory, valence bond theory, hybridisation, molecular orbital theory for homonuclear diatomic molecules, and hydrogen bonding.

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A focused, distraction-free run through 50 multiple-choice questions. Hints if you need them; your score at the end.

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Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Topic 4.1

Kossel-Lewis Approach and Ionic Bonding

Octet idea, Lewis symbols, electron transfer, ionic or electrovalent bond formation and lattice-based reasoning

Topic 4.2

Covalent Bonding, Lewis Structures and Bond Parameters

Shared electron pairs, Lewis structures, resonance, bond length, bond enthalpy, bond angle and dipole moment

Topic 4.3

VSEPR Theory and Molecular Shapes

Electron-pair repulsion, molecular geometry, lone-pair effects and shape prediction

Topic 4.4

Valence Bond Theory, Hybridisation, Sigma and Pi Bonds

Orbital overlap, directional covalent bonds, hybrid orbitals and sigma/pi bond counting

Topic 4.5

Molecular Orbital Theory and Hydrogen Bonding

Bond order, magnetic character of homonuclear diatomic molecules and inter-/intramolecular hydrogen bonding

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