Question 1
Question detail
Explain the bonding model for benzene using delocalised electrons.
Try the question, check the answer, then read the explanation to understand the curriculum point.
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Topic
Aromatic chemistry (A-level only)
Question
Explain the bonding model for benzene using delocalised electrons.
Answer
Benzene has a planar structure with six carbon atoms forming a hexagonal ring. Each carbon atom is bonded to one hydrogen atom and has one unhybridized p-orbital that overlaps with adjacent p-orbitals, creating a system of delocalised electrons above and below the plane of the ring. This delocalisation contributes to the stability of benzene.
Explanation
This answer is strong as it accurately describes the bonding model of benzene, focusing on the role of delocalised electrons. The question tests understanding of aromatic stability and the unique bonding characteristics of benzene compared to alkenes.
Common mistake
Misunderstanding Delocalisation
Students often think that benzene has alternating single and double bonds instead of a delocalised electron model.
To correct this, remember that benzene's structure is represented by a hexagonal ring with delocalised electrons, which are shared across all carbon atoms, leading to equal bond lengths.
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