IGNOU BCHCT 133 2026 - How would you prepare benzene from ethyne? Write its mechanism.

Question

How would you prepare benzene from ethyne? Write its mechanism.

19 Jan 2026

Answer :

Word Count : 152

Benzene can be prepared from ethyne (acetylene) by the process of trimerization of acetylene. This is a classic method in organic chemistry. Reaction: 3 C₂H₂ → C₆H₆ Stepwise mechanism (Catalytic trimerization): 1. Activation of acetylene: Acetylene molecules are activated in the presence of a catalyst like AlCl₃, FeCl₃, or transition metal salts (e.g., Ni, Pd, or Cu salts). 2. Formation of

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