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Heat of hydrogenation of cyclohexene to ...

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 `:`

A

48 kcal `//`mole

B

36kcal `//`mole

C

24 kcal `//`mole

D

12 kca `//`mole

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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.

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

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

The enthalpy of hydrogenation for 1-pentene is +126 kJ/mol. The enthalpy of hydrogenation for 1, 3-pentadiene is +230 kJ/mole. Hence estimate the resonance energy of 1, 3-pentadiene.

If enthalpy of hydrogenation of cyclohexene is [-x kJ mol^-1] and resonance energy of benzene is [-y kJ mol^-1] then the enthalpy of hydrogenation of benzene will be

The enthalpy of combustion at 25^(@)C of H_(2)(g) , cyclohexane and cyclohexene are -241, 3920 and -3717 kJ "mole"^(-1) respectively. The heat of hydrogenation of cyclohexene is ( Kcal/mole) approximate integer:

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Which of the following has the smallest heat of hydrogenation per mole ?

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Knowledge Check

  • Observed heat of hydrogenation for cyclohexa-1,4-diene and cyclo hexa-1,3-diene is x & y kcal/mol respectively, calculate the resonance energy of cyclohexa-1,3-diene :

    A
    `(3x)/2-y`
    B
    `(2x)/2-y`
    C
    `(3y)/2-y`
    D
    `(2y)/2-x`
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