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Thermodynamics question

2006 · Q117
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Thermodynamics question

2006 · Q117

NEETChemistryThermodynamicsMCQ+4 / −1
The enthalpy of hydrogenation of cyclohexene is is −-− 119.5 kJ mol−-−1. If resonance energy of benzene is −-− 150.4 kJ mol−-−1, its enthalpy of hydrogenation would be
  1. A
    −-− 358.5 kJ mol−-−1
  2. B
    −-− 508.9 kJ mol−-−1
  3. C
    −-− 208.1 kJ mol−-−1
  4. D
    −-− 269.9 kJ mol−-−1
View written solutionFree

Correct answer: C

AIPMT 2006 Chemistry - Thermodynamics Question 48 English Explanation


The resonance energy provides extra stability to the benzene molecule so it has to over come for hydrogenation to take place.

So Δ\Delta ΔH = – 358.5 – (–150.4) = –208.1 kJ

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