Task 5.3(a)(i).2

carbon-carbon single bond in cyclohexane      0.154nm
carbon-carbon double bond in cyclohexene    0.133nm
carbon-carbon bond in benzene                      0.139nm

Comment on the length and strength of bonds in benzene.

The enthalpy of hydrogenation of cyclohexane is given below:
C6H10 +H2 --> C6H12  ; DH = - 120kJmol^-1
What is the enthalpy of benzene if it contains 3 C-C double bonds?

The experimental value for the enthalpy of hydrogenation of benzene is given below.
C6H6 +3H2  --> C6H12 ; DH = -208kJmol^-1
Explain why the calculated value and the experimental values are not the same.