Which one of the following contain isopropyl group?

1. $2-$Methylpentane
2. $2, 2, 3, 3-$Tetramethylpentane
3. $2, 2, 3-$Trimethylpentane
4. $3, 3-$Dimethylpentane

Solution

Isopropyl group $-\mathrm{CH}{\left({\mathrm{CH}}_3\right)}_2$ is attached to the propyl group in $2-\mathrm{methylpentane}$. 

                                       $2-$methylpentane ~

Asked in: JEE-TOPICTESTS-CHEMISTRY

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