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The enthalpy of hydrogenation of of cyclohexene is - 119.5 kilo Joule per mole if resonance energy of benzene is -1 50.4 kilo joule per mole is enthalpy of hydrogenation be

The enthalpy of hydrogenation of of cyclohexene is - 119.5 kilo Joule per mole if resonance energy of benzene is -1 50.4 kilo joule per mole is enthalpy of hydrogenation be

Grade:12

1 Answers

Arun
25750 Points
5 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
 
 
Regards
Arun

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