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In the modern delocalised model of benzene, each carbon atom forms three [ ] and contributes one electron to a π\piπ-system created by the sideways overlap of p-orbitals.
In the final step of the mechanism for chlorination, a(n) H+\text{H}^+H+ ion reacts with AlCl4−\text{AlCl}_4^-AlCl4− to regenerate the AlCl3\boxed{\text{AlCl}_3}AlCl3 catalyst.
The bromination of phenol produces a white precipitate of 2,4,6-tribromophenol.
In the modern delocalised model of benzene, each carbon atom forms three σ\sigmaσ-bonds and contributes one electron to a π\piπ-system created by the sideways overlap of p-orbitals.
- Expected ΔHhydro\Delta H_{hydro}ΔHhydro for Kekulé structure is 3×−120=−360 kJ mol−13 \times -120 = -360\text{ kJ mol}^{-1}3×−120=−360 kJ mol−1.
- Actual ΔHhydro\Delta H_{hydro}ΔHhydro of benzene is −208 kJ mol−1-208\text{ kJ mol}^{-1}−208 kJ mol−1.
- Benzene is 152 kJ mol−1152\text{ kJ mol}^{-1}152 kJ mol−1 more stable than expected (delocalisation energy).
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Aromatic compounds Flashcards
26 flashcards on OCR A A Level Chemistry Aromatic compounds: the key terms, definitions and equations you need to recall for Component 01, Component 02 and Component 03.