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Grade 11Differential Calculus

Enthalpy of hydrogenation of cyclohexane is -119kj/mol. And that of benzene is -208kj/mol. Resonance energy of benzene
Options are. -119kj/mol
-238kj/ mole
-149kj /mol
-565kj /mol

Profile image of Sameeksha
8 Years agoGrade 11
Answers icon

1 Answer

Profile image of Arun
8 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*x kJ = 208.
 
Hence
3x = -358.4
x = - 119.46 KJ/mol
 
Regards
Arun (askIITians forum expert)
 

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