Compare positive magnitudes of the total molar heats released on complete hydrogenation of the compounds (not heat per double bond):
(1) (2) (3) (4)

Question

Compare positive magnitudes of the total molar heats released on complete hydrogenation of the compounds (not heat per double bond): (1) (2) (3) (4)

TestHub · Accepted Answer

Here heat of hydrogenation is compared per mole of the complete compound, not per double bond. As the number of reducible double bonds increases from 4 to 1, more heat is released overall despite resonance stabilization. The source's magnitude order is 4 < 3 < 2 < 1. State magnitude rather than signed enthalpy.

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