Mixture of catalysts Cr2O3 + A?2O3 + SiO2 at 500?C are used when benzene is prepared from_______________?
Correct answer: B. N-hexane
- A. acetylene
- B. N-hexane
- C. Benzene sulphonic acid
- D. Sodium benzoate
Explanation
N-hexane undergoes catalytic dehydrocyclisation, losing hydrogen and forming a six-membered aromatic ring, benzene. The catalyst mixture is typically chromium oxide, aluminium oxide and silica at about 500 C. The likely mistake is acetylene, which forms benzene by cyclotrimerisation using a different preparation route and catalyst.
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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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