What are the three pieces of evidence that disprove the Kekulé model of Benzene?

The enthalpy change of hydrogenation is less exothermic than suggested by the Kekulé model ( -208kJmol-1 instead of the expected -357kJmol-1), meaning Benzene is more thermodynamically stable than the Kekulé model predicts. The Kekulé model also suggests Benzene has 3 shorter C=C bonds and 3 longer C-C bonds. However, in reality, all bonds in Benzene are the same length. Furthermore, the Kekulé model suggests Benzene readily reacts with bromine water. However, the bromination of Benzene does not occur readily and requires a catalyst: the final evidence against the Kekulé model.

Related Chemistry A Level answers

All answers ▸

Why does the bromine become polarised in HBr during electrophilic addition


How do I balance redox equations in acidic reactions, without trial and error, using half equations?


Calculate the mass in grams of Iron (III) Chloride in a solution of 500 cm^3 which has a concentration of 0.200 mol/dm^3


How does the structure and bonding of alkanes differ to that of alkenes?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo
Cookie Preferences