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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 _________ _____ _____ _______ ____ ______.
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