The total number of structural isomers possib | vedclass

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(A) For the molecular formula $C_9H_{12}$,the degree of unsaturation is $4$,which corresponds to a benzene ring ($3$ double bonds + $1$ ring). We need

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$8$

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(A) For the molecular formula $C_9H_{12}$,the degree of unsaturation is $4$,which corresponds to a benzene ring ($3$ double bonds + $1$ ring). We need to find the number of structural isomers for substituted benzene derivatives. The possible isomers are: $1$. $n$-Propylbenzene $2$. Isopropylbenzene (Cumene) $3$. $1$-Ethyl-$2$-methylbenzene ($o$-Ethyltoluene) $4$. $1$-Ethyl-$3$-methylbenzene ($m$-Ethyltoluene) $5$. $1$-Ethyl-$4$-methylbenzene ($p$-Ethyltoluene) $6$. $1,2,3$-Trimethylbenzene (Hemimellitene) $7$. $1,2,4$-Trimethylbenzene (Pseudocumene) $8$. $1,3,5$-Trimethylbenzene (Mesitylene) Thus,the total number of structural isomers is $8$.

The total number of structural isomers possible for the substituted benzene derivatives with the molecular formula $C_9H_{12}$ is $.........$

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