Chemistry - Nomenclature Question with Solution | TestHub

2,3-Dimethylhexane is a six-carbon chain with one methyl group on ${\mathrm{C}}_2$ and one on ${\mathrm{C}}_3$.

Structure (ii) is $\mathrm{C}{\mathrm{H}}_3\mathrm{CH}(\mathrm{C}{\mathrm{H}}_3)\mathrm{CH}(\mathrm{C}{\mathrm{H}}_3)\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_3$: a hexane chain with methyl groups on ${\mathrm{C}}_2$ and ${\mathrm{C}}_3$. (i) and (iii) are both 3,4-dimethylhexane (the methyl groups are on ${\mathrm{C}}_3$ and ${\mathrm{C}}_4$ of a hexane chain), and (iv) is 2,4-dimethylpentane.