Which one of the following statement is not correct about benzene ?
Correct answer: D. Resonance energy of benzene is 150.5 K Cal/mole
- A. On hydrogenation 208 KJ/mole is liberated
- B. C-H bond length in benzene is 1.09 A?
- C. Molecular mass of benzene is 78.108
- D. Resonance energy of benzene is 150.5 K Cal/mole
Explanation
Benzene has a hydrogenation enthalpy of about 208 kJ/mol, C-H bonds of about 1.09 A, and a molecular mass of about 78.108 g/mol. Its resonance energy is about 150.5 kJ/mol, not 150.5 kcal/mol, so option d is the incorrect statement. Students may choose option a by confusing the hydrogenation energy with the resonance energy.
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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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