The resonance energy of benzene is:
Correct answer: C. +150.5 kJ/mol
- A. -119.5 kJ/mol
- B. -358.5 kJ/mol
- C. +150.5 kJ/mol
- D. -208 kJ/mol
Explanation
Resonance energy is the difference between the actual enthalpy of hydrogenation of benzene (-208 kJ/mol) and the theoretical enthalpy calculated for a hypothetical "cyclohexatriene" molecule (3x-119.5-358.5 kJ/mol). The difference, 150.5 kJ/mol, represents the extra stability due to resonance, which is called resonance energy.
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Hydrocarbons are studied through the structures and reactions of alkanes, alkenes, alkynes and aromatic compounds. Coverage includes free radical substitution in alkanes, electrophilic addition to carbon-carbon multiple bonds, benzene substitution, aromatic stability and the difference between addition reactions of alkenes and substitution reactions of benzene.
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