In the following reaction,CH_3-C equiv CH xri | vedclass

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(A) The reaction of propyne $(CH_3-C \equiv CH)$ with a red hot iron tube at $873 \ K$ is a cyclic polymerization reaction.Three molecules of propyne

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$21$

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(A) The reaction of propyne $(CH_3-C \equiv CH)$ with a red hot iron tube at $873 \ K$ is a cyclic polymerization reaction.Three molecules of propyne undergo cyclization to form $1,3,5$-trimethylbenzene (mesitylene) as the product $A$.The structure of $1,3,5$-trimethylbenzene is a benzene ring with three methyl groups at positions $1, 3,$ and $5$.To calculate the number of $\sigma$ bonds in $1,3,5$-trimethylbenzene $(C_9H_{12})$:- There are $6$ $\sigma$ bonds in the benzene ring ($C$-$C$ bonds).- There are $3$ $\sigma$ bonds between the ring carbons and the methyl carbons.- Each of the $3$ methyl groups has $3$ $C$-$H$ $\sigma$ bonds,totaling $3 	imes 3 = 9$ $\sigma$ bonds.- There are $3$ $\sigma$ bonds between the ring carbons and the remaining $3$ hydrogens,totaling $3$ $\sigma$ bonds.Total $\sigma$ bonds = $6 	ext{ (ring C-C)} + 3 	ext{ (ring-methyl C-C)} + 9 	ext{ (methyl C-H)} + 3 	ext{ (ring C-H)} = 21$.Thus,the product $A$ contains $21$ $\sigma$ bonds.

In the following reaction,
$CH_3-C \equiv CH \xrightarrow[873 \ K]{\text{red hot iron tube}} A$
the number of sigma$(\sigma)$ bonds present in the product $A$ is

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In the following reaction,$CH_3-C \equiv CH \xrightarrow[873 \ K]{\text{red hot iron tube}} A$the number of sigma$(\sigma)$ bonds present in the product $A$ is