In 1865, Friedrich August Kekulé suggested a structure for benzene which consisted of alternating single and double carbon-carbon bonds. However, modern analytical techniques indicate a structure in which the electrons are delocalised. State how the enthalpy changes of hydrogenation for cyclohexene and benzene (1) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................

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Exam No：wch15-01-que-20240113 Year：2024 Question No：13(c)

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An answer that makes reference to the following points:
- the Kekulé structure would be expected to have an enthalpy change of hydrogenation of \(3 \times-118 \mathrm{~kJ} \mathrm{~mol}^{-1} /-354 \mathrm{~kJ} \mathrm{~mol}^{-1}\) (which is significantly different from the actual value of \(-205 \mathrm{~kJ} \mathrm{~mol}^{-1}\) )

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