Problem $1(12$ questions, $6$ points each, Total $72$ points$)$

The table below gives the hydrocarbons which have been identified in the gasoline fraction of a crude oil. Identify the paraffins, naphthenes, and aromatics. Explain your answer by following the example given in the hint $(5$ points each for explanation$).$

Hydrocarbon

Methylcyclohexane

$2-$ Methylbutane $($Isopentane$)$

Cyclopentane

Methylbenzene $($Toluene$)$

Methylcyclopentane

$2,2-$ Dimethylpropane $($Neopentane$)$

PETR $2313$ SPRING $2024$ University of Houston

$1$

$1,3-$ Dimethylcyclohexane

$2-$ Methylpentane $($Isohexane$)$

$2,5-$ Dimethylheptane

$1,4-$ Dimethylbenzene $($para$-$Xylene $=p-$Xylene$)$

$1,3-$ Dimethylbenzene $($meta$-$Xylene $=m-$Xylene$)$

$1,2-$ Dimethylbenzene $($ortho$-$Xylene $=$ o$-$Xylene$)$

Hint:

$2,3-$ Dimethylpentane

Structure:

Molecular Formula: $C_7{H}_{16}$

It is a paraffin because its name contains the suffix $-$ane which classifies this compound as an ALKANE. Also, all bonds between carbon$-$to$-$carbon atoms are single bonds.