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

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(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

Vedclass · Accepted Answer

$21$

Vedclass · Answer

(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

Similar Questions

What will be $C$ in the following reaction?
$C_6H_5CH_3$ $\xrightarrow{\text{Oxidation}} A$ $\xrightarrow{NaOH} B$ $\xrightarrow[\Delta]{\text{sodalime}} C$

Which of the following is true about the following groups when attached to a benzene ring?

The best reagent for nuclear iodination of aromatic compounds is:

What type of difference is observed in the hybridization of carbon in benzene during nitration and the formation of the $\sigma$-complex?

Vedclass Test Series

Exam Paper Generator

Online Exam Module

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