Petroleum ether can be used as

Identify the hydrocarbon compound from the following containing carbon atoms in the range of $C_{6}$ to $C_{8}$?

The product formed in the first step of the reaction of $CH_3-CH_2-CH(Br)-CH_2-CH(Br)-CH_3$ with excess $Mg / Et_2O$ $(Et = C_2H_5)$ is

The reaction of lithium di-$3-$pentylcuprate with ethyl bromide yields an alkane with the molecular formula $C_7H_{16}$. What is the structure of the alkane?

Identify the major product of the following reaction: $CH_3-CH_2-COONa \xrightarrow{\text{Kolbe's Electrolysis}}$

Which is the smallest alkane that exhibits isomerism?