WJEC A Level Chemistry
WJEC A Level Chemistry 4.2 Aromaticity Exam Questions
Free WJEC A Level Chemistry exam questions on 4.2 Aromaticity, with mark schemes. Covers the structure of benzene, delocalisation and electrophilic substitution.
4.2 Aromaticity exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
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WJEC A Level Chemistry Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About WJEC A Level Chemistry 4.2 Aromaticity
This topic covers benzene and its reactions.
What you need to know
- Structure Delocalised π system, evidence from bond lengths and enthalpy of hydrogenation.
- Stability Benzene resists addition reactions.
- Electrophilic substitution Nitration, halogenation and Friedel-Crafts reactions with mechanisms.
- Phenol comparison Phenol reacts more readily due to lone pair donation into the ring.
Common mistakes in 4.2 Aromaticity
- Drawing benzene with three fixed double bonds when explaining stability.
- Forgetting to show the regeneration of the catalyst.
- Saying benzene undergoes addition with bromine.
Try three 4.2 Aromaticity exam-style questions
1. Give one piece of evidence for delocalisation in benzene. (1 mark)
Show the mark scheme answer
All C-C bond lengths are equal, or hydrogenation enthalpy is less exothermic than expected.
2. State the electrophile in nitration of benzene. (1 mark)
Show the mark scheme answer
NO₂⁺.
3. Explain why benzene does not decolourise bromine water. (1 mark)
Show the mark scheme answer
Addition would disrupt the stable delocalised system.
4.2 Aromaticity FAQs
What does Aromaticity cover?
Benzene structure, stability and electrophilic substitution.
Do I need mechanisms?
Yes, electrophilic substitution with curly arrows.
How is NO₂⁺ formed?
From concentrated nitric and sulfuric acids.
Revise this topic with flashcards: WJEC A Level Chemistry Flashcards, with mark scheme answers for Anki and Quizlet.
