The compound C₁₈H₃₈ is a component of fuel oil that can be converted by a cracking process into two compounds suitable for use in gasoline. The compounds have the formulas C_nH_2n + 2 and C_nH_2n, with the value of n being the same in each. Each compound has a straight chain of carbon atoms, with no branches. Draw possible structural formulas for the two compounds and name them.