Short answer·Standard multi-step (3/5)·No calculator
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.
Question
All carbon-carbon bonds in benzene have the same length, intermediate between a single and a double bond. Explain this observation.
Total: 3 marks
(a) State the electron feature of benzene responsible for this. (1 mark)
(b) Explain why fixed alternating single and double bonds are inadequate. (1 mark)
(c) Relate this to equal bond lengths. (1 mark)
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