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Question

The enthalpy of hydrogenation of cyclohexene is 119.5 kJ/mol. What is the enthalpy of benzene, if its resonance energy is 150.4 kJ/mol?

A
269 kJ/mol
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B
358.8 kJ/mol
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C
508.9 kJ/mol
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D
208.1 kJ/mol
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Solution

The correct option is D 208.1 kJ/mol
Enthalpy of hydrogentaion of cyclohexene = 119.5 kJ/mol
calculated enthalpy of hydrogenation of benzene is: 3(119.5) = 358.5 kJ/mol
Since the actual value should be lower by an amount equal to resonance energy, actual enthalpy of hydrogenation is
= 358.5 kJ/mol (150.4 kJ/mol)
= 208.1 kJ/mol

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