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Grade: 11
        
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
one year ago

Answers : (1)

Arun
15903 Points
							
 
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)
 
11 months ago
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