The lower enthalpy change of hydrogenation value suggests the □-bond electrons are delocalized over the entire The enthalpyĬhange of hydrogenation for benzene is only − 2 0 8 kJ⋅mol −1Īnd this suggests that benzene molecules cannot contain three C C double bonds. The enthalpy change of hydrogenation for a six-membered ring with three C C doubleīonds to be − 3 6 0 kJ⋅mol −1. − 1 2 0 kJ⋅mol −1 and we therefore expect that The enthalpy change of hydrogenation for cyclohexene is It is also easier to understand the enthalpy change of hydrogenation for benzene if we use the delocalized electronĭensity model. ![]() They must contain much less reactive delocalized rings of Benzene molecules must not have any electron-richĬ C double bonds whatsoever. Bromine molecules would readily react with benzene molecules if they containedĮlectron-rich C C double bonds. Out over the whole benzene ring structure. Inability to decolorize bromine water is difficult to explain if we assume that benzene has three C Cĭouble bonds, but it is less challenging to explain if we assume that the □-bond electrons are spread Of chemical reactivity and it does not tend to decolorize bromine water at room temperature and atmospheric pressure. Benzene is known to have a surprising lack The delocalized electron model is able to explain the unique properties of benzene. □ bonds that spread out over the whole hydrocarbon ring structure. The last remaining valence electrons interact with one another and create Each carbon atom has four valence electrons and three of these electrons are used to create sigma Molecules have delocalized rings of electron density that form when the unhybridized p orbitals of carbon atoms interact ![]() Physical and chemical properties of benzene in terms of delocalized electron density interactions. This model proved to be too simplistic and it was later revised again by other scientists. This statement can be used to determine that option B is the correct answer for this question. Proposition was somewhat inaccurate, he is nonetheless still credited with proposing and publishing the correct structure Kekulé was the first scientist to predict that benzene has an unusual resonance structure, and although his Which chemist is often credited with proposing and publishing the correct structure of benzene? Example 1: Identifying Which Scientist Helped Clarify the Structure of Benzene
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