Use the following information to answer the next question.

A student drew the structural diagram shown below.

Eight$-$Carbon Structures

$1$

$5$

$2$ oct$-3-$ene

$6$

$2,3-$dimethyl$-1-$propylcyclopropane

$3$

$2,3-$dimethylhex$-2-$ene

$7$

octane

$43,3-$dimethylliexane

The eight$-$carbon structures numbered above that are isomers of the structural diagram that the student drew ar and

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