What catalyst is employed when benzene is prepared from acetylene at 70°C?
Correct answer: C. Organo-nickel
- A. Cr2O3 + A2O3 + SiO2
- B. Raney nickel
- C. Organo-nickel
- D. Ni 250 - 300°C
Explanation
At about 70°C, acetylene can undergo cyclotrimerisation to form benzene in the presence of an organo-nickel catalyst. Raney nickel and the nickel catalyst at 250 to 300°C are associated with other reactions or conditions, so students may choose option b by recognising nickel but ignoring the specified temperature.
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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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