AQA Jun 2015 Paper 4 Q8

Answers available below

do not write outside the box equations for the hydrogenation of cyclohexene and of benzene together with the enthalpies of hydrogenation are shown h h h kj mol h kj mol a i use these data to show that benzene is kj mol more stable than the hypothetical compound cyclohexa triene mark a ii state in terms of its bonding why benzene is more stable than cyclohexa triene mark b three carbon carbon bonds are labelled on the structures shown these bonds are of different lengths write the letters w x and y in order of increasing bond length mark wmp jun chem c the structures of two cyclic dienes are shown do not write outside the box cyclohexa diene cyclohexa diene c i use the enthalpy of hydrogenation data given opposite to calculate a value for the enthalpy of hydrogenation of cyclohexa diene mark c ii predict a value for the enthalpy of hydrogenation of cyclohexa diene mark c iii explain your answers to questions c i and c ii in terms of the bonding in these two dienes marks turn over wmp jun chem

Show answer