ThermochemistryHard

Question

The enthalpy of hydrogenation of benzene is −49.8 kcal/mol while its resonance energy is 36.0 kcal/mol. The enthalpy of hydrogenation of cyclohexene is

Options

A.−4.6 kcal
B.−28.6 kcal/mol
C.−85.8 kcal/mol
D.−13.8 kcal/mol

Solution

Required $\Delta H = - \left\lbrack \frac{49.8 + 36.0}{3} \right\rbrack = - 28.6\text{ kcal/mol}$

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