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The enthalpy of hydrogenation of cyclohexene is -119.5 kJ mol-1. Ilf resonance energy of benzene is -150.4 kJ mol-1, its enthalpy of hydrogenation would be

The enthalpy of hydrogenation of cyclohexene is -119.5 kJ mol-1. Ilf resonance energy of benzene is -150.4 kJ mol-1, its enthalpy of hydrogenation would be

Grade:12th pass

2 Answers

Vikas TU
14149 Points
7 years ago
Cyclohexene after hydrogenation would be converted to purely saturated cyclohexane.
As cyclohexene has one pi bond its enthalpy of hydrogenation is -119.5 kJ mol-1.
In benzene there are 3 pi bonds hence the enthalpy of hydrogenation = -150.4 kJ –  3 * -119.5 kJ.
=> 208 kJ
 
 
Rishi Sharma
askIITians Faculty 646 Points
3 years ago
Dear Student,
Please find below the solution to your problem.

Cyclohexene after hydrogenation would be converted to purely saturated cyclohexane.
As cyclohexene has one pi bond itsenthalpy of hydrogenation is -119.5 kJ mol-1.
In benzene there are 3 pi bonds hence theenthalpy of hydrogenation
= -150.4 kJ –3*(- 119.5 kJ) .
=> 208 kJ

Thanks and Regards

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