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Cyclic polymerisation of alkynes
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In the following reaction, $H_3C-C\equiv CH\xrightarrow[873\ K]{red\ hot\ iron\ tube}A$ the number of sigma ($\sigma$) bonds present in the product A is:Propyne trimerises in a red hot iron tube at 873 K to give mesitylene (1,3,5-trimethylbenzene, $C_9H_{12}$). $\sigma$ bonds: 6 ring C-C + 3 C-$CH_3$ + 12 C-H = 21.