The 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:

Question

Accepted Answer

−358.5 kJ mol⁻¹. Three isolated C=C bonds would hydrogenate with an enthalpy of 3 × (−119.5) = −358.5 kJ mol⁻¹. Benzene’s resonance energy means it is stabilized relative to that hypothetical value, so the expected enthalpy matches this option.

The 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:

Solution

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