The cyclic polymerization of propyne (methylacetylene) by passing it through a red-hot iron tube at K yields which of the following aromatic compounds?

Question

The cyclic polymerization of propyne (methylacetylene) by passing it through a red-hot iron tube at $873$ K yields which of the following aromatic compounds?

Prashant Kotian · Accepted Answer

Correct answer: C. Under the conditions of a red-hot iron tube, three molecules of propyne undergo cyclic trimerization. The methyl groups orient themselves symmetrically to minimize steric hindrance, resulting in the formation of 1,3,5-trimethylbenzene, commonly known as mesitylene.

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