3. An unknown compound, believed to be a hydrocarbon, showed the following behavior: it burned with a yellow sooty flame; no heat or color appeared when sulfuric acid was added; permanganate solution remained purple; the red color of bromine solution was lost only after a catalyst was added. From the compounds below, circle the one that fits the observations. Write equations for the tests that work.
CH3CH2CH2CH2CH3 [Cyclohexene Structure] [Benzene Structure] H - C ? C - CH2CH2CH3