Enthalpy of hydrogenation of one mol benzene to cyclohexane is :
Given : Resonance energy of benzene = – 70 kJ/mol
Enthalpy of hydrogenation of cyclohexene = – 100 kJ/mol

Question

Enthalpy of hydrogenation of one mol benzene to cyclohexane is : Given : Resonance energy of benzene = – 70 kJ/mol Enthalpy of hydrogenation of cyclohexene = – 100 kJ/mol

TestHub · Accepted Answer

Question Explanation:

Calculating enthalpy of hydrogenation including resonance energy.

Concept:

Enthalpy of Hydrogenation.

Solution:

The experimental enthalpy of hydrogenation is the difference between the theoretical value (based on cyclohexene) and the resonance energy of the aromatic ring.

Experimental $Δ H =$ Theoretical $Δ H$ - Resonance Energy .

$= 70 + (- 300) = - 230 kJ$

Final Answer: $- 230 kJ mol^{- 1}$ (Option D)

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Options:

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