Chemical Thermodynamics Question 381

Question: The enthalpy of hydrogenation of cyclohexene is −119.5kJmol−1 . If resonance energy of benzene is −150.4kJmol−1 , its enthalpy of hydrogenation would be

Options:

A) −208.1kgmol−1

B) −269.9kgmol−1

C) −358.5kgmol−1

D) −508.9kgmol−1

Show Answer

Answer:

Correct Answer: A

Solution:

  • =−358.5,KJ The resonance energy provides extra stability to the benzene molecule so it has to be overcome for hydrogenation to take place. So ΔH=−358.5−(−150.4)=−208.1kJ
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