Edexcel IAL Chemistry A2 18.1 thermochemical and X-ray evidence for benzene
Edexcel IAL Chemistry A2 18.1 thermochemical and X-ray evidence for benzene
Use each evidence type precisely: enthalpy data shows unusual stability, X-ray data shows equal C-C bond lengths, and dichlorobenzene isomer counts reject Kekulé-only structures.
How this is tested
- Calculate or compare hydrogenation and bond enthalpy data for benzene stability.
- Use X-ray bond lengths to argue for equal C-C bonds and delocalisation.
- Use dichlorobenzene isomer evidence to reject alternating single and double bonds.