The resonance energy of benzene is__________________?
Correct answer: A. 150.5 kJ/mol
- A. 150.5 kJ/mol
- B. 250.5 kJ/mol
- C. 150.5 Cal/mol
- D. 250.5 Cal/mol
Explanation
The resonance energy of benzene is approximately 150.5 kJ/mol, representing the extra stability caused by delocalisation of its pi electrons. Students may choose 150.5 Cal/mol by confusing kilojoules with calories, or 250.5 kJ/mol by recalling an incorrect numerical value.
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About Benzene and Aromatic Compounds
Benzene has a planar ring of delocalised π electrons, giving aromatic stability and equal carbon-carbon bond lengths. The topic covers resonance, electrophilic substitution reactions such as nitration, halogenation, sulphonation and Friedel-Crafts reactions, along with substituent effects and the distinction between substitution in benzene and addition in ordinary alkenes.
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