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IB Chemistry HL 2.2.12 Hl Benzene C H Questions

Use physical and chemical evidence to describe benzene as a planar resonance-stabilized ring with six delocalized π electrons and equivalent intermediate C–C bonds.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • Use equal intermediate C–C bond lengths, bond order 1.5 and related physical evidence to reject an alternating localized single/double-bond model.
  • Describe benzene as a planar six-membered ring with six delocalized π electrons and equivalent C–C bonds represented by resonance.
  • Explain why benzene favours electrophilic substitution and is more stable than a localized cyclohexatriene, using chemical or thermochemical evidence.

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Study 2.2.12 (HL)—Benzene (C₆H₆) conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry HL 2.2.12 Hl Benzene C H Questions question 1

[Maximum number: 2]

Benzene is an aromatic hydrocarbon.

Discuss the physical evidence for the structure of benzene.

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