Verified Solution • 2025–26 Session moderate

QAIPMT-2006-Ch-2387: NEET 2006 Chemistry - Class 11 AIPMT-2006-Ch-2387 Solution: The enthalpy of hydrogenation of cyclohexene is \(-119.5\ {kJ…

The enthalpy of hydrogenation of cyclohexene is −119.5 kJ mol−1-119.5\ \text{kJ mol}^{-1}. If resonance energy of benzene is −150.4 kJ mol−1-150.4\ \text{kJ mol}^{-1}, its enthalpy of hydrogenation would be

Multiple Choice Options

  • A −358.5 kJ mol−1-358.5\ \text{kJ mol}^{-1}
  • B −508.9 kJ mol−1-508.9\ \text{kJ mol}^{-1}
  • C −208.1 kJ mol−1-208.1\ \text{kJ mol}^{-1}
  • D −269.9 kJ mol−1-269.9\ \text{kJ mol}^{-1}

Step-by-Step Verified Solution

The resonance energy provides extra stability to the benzene molecule so it has to over come for hydrogenation to take place. So _ H = � 358.5 � (�150.4) = �208.1 kJ

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