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Enthalpy of hydrogenation of benzene is ...

Enthalpy of hydrogenation of benzene is `DeltaH_(1)` and for cyclohexene is `DeltaH_(2)`. The resonance energy of benzene is

A

`3DeltaH_(1) - DeltaH_(2)`

B

`3DeltaH_(2)-DeltaH_(1)`

C

`3DeltaH_(1) +DeltaH_(2)`

D

`DeltaH_(1) -3DeltaH_(2)`

Text Solution

Verified by Experts

Heat of hydrogenation is always negative and benzene is more stable than cyclohexatriene. Therefore, resonance enegy should be negative.
`:. 3DeltaH_(2) - DeltaH_(1)`
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Heat of hydrogenation of cyclohexene to cyclohexane is -28.6kcal // mole. The observed heat of hydrogenation of benezene to cyclohexane is -49.8 kcal // mole. The resonance energy of benzene is :

Heat of hydrogenation of cyclohexene to cyclohexane is -28.6 kcal/mol.The observed heat of hydrogenation of benzene to cyclohexane is -49.8 kcal/mol. Calculate the resonance energy of benzene in kcal/mole.

Knowledge Check

  • Heat of hydrogenation of ethene is x_(1) and that of benzene is x_(2) . Hence resonance energy of benezene is

    A
    `x_(2)-3x_(1)`
    B
    `x_(1)+x_(2)`
    C
    `3x_(1)-x_(2)`
    D
    `x_(1)-3x_(2)`

  • Thre resonance energy of benzene is approximately

    A
    18 kcal `mol^(-1)`
    B
    37 kcal `mol^(-1)`
    C
    54 kcal `mol^(-1)`
    D
    48 kcal `mol^(-1)`

  • Heat of hydrogenation of ethene is x_(1) and that of benzene is x_(2) . Hence, resonance energy is:

    A
    `x_(1)-x_(2)`
    B
    `x_(1)+x_(2)`
    C
    `3x_(1)-x_(2)`
    D
    `x_(1)-3x_(2)`

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    Enthalpy of hydrogenation of one mole benzene to cyclohexane is : [Given : Resonance energy of benzene=-70KJ/mol, Enthalpy of hydrogenation of cyclohexene =-100KJ/mol]

    Enthalpy of hydrogenation of cyclohexene is -119-5 "kJ mol"^(-1) . If resonance energy of benzene is - 150.4 kJ mol^(-1) , its enthalpy of hydrogenation would be

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