Benzene is heated in air with V2O5 at 450°C it undergoes________________?
Correct answer: D. Oxidation reaction
- A. Substitution reaction
- B. Addition reaction
- C. Elimination reaction
- D. Oxidation reaction
Explanation
Heating benzene with air over V2O5 oxidises the ring, commonly producing maleic anhydride, so the reaction is an oxidation reaction. The catalyst promotes reaction with oxygen rather than replacement of a ring hydrogen by another group. The likely mistake is substitution, because substitution is benzene's usual reaction type, but these conditions specifically cause catalytic oxidation.
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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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