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  • The enthalpy of hydrogenation of cyclohexane is -119.5 kJ . If resonance energy of benzene is -150.4 kJ <

The enthalpy of hydrogenation of cyclohexane is -119.5 kJ mol^{-1} . If resonance energy of benzene is -150.4 kJ mol^{-1}  ,its enthalpy of hydrogenation would be

Option: 1

-208.1 kJ mol^{-1}


Option: 2

-269.9 kJ mol^{-1}


Option: 3

-358.5 kJ mol^{-1}


Option: 4

-508.9 kJ mol^{-1}


Answers (1)

best_answer

Enthalpy of hydrogenation of  =-119.5kj/mol

                   (having one double bond)

The Enthalpy of hydrogenation of =3\times -119.5\, kj/mol

(having three double bond) =-358.5, kj/mol

R.E = Theoretical enthalpy - Actual enthalpy

-150.4 = -358.5 -Actual enthalpy of hydrogenation of benzene

Actual enthalpy of

hydrogenation of benezene = = -208.1kj / mol

Option (1) is correct answer

 

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Gunjita

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