In each of the following groups of compounds, identify the one with the largest heat of combustion and the one with the smallest. (Try to do this problem without consulting Table 2.5.)
(a) Hexane, heptane, octane
(b) Isobutane, pentane, isopentane
(c) Isopentane, 2-methylpentane, neopentane
(d) Pentane, 3-methylpentane, 3,3-dimethylpentane
(e) Ethylcyclopentane, ethylcyclohexane, ethylcycloheptane