Propane (C3H8\text{C}_3\text{H}_8C3H8), heptane (C7H16\text{C}_7\text{H}_{16}C7H16), and docosane (C22H46\text{C}_{22}\text{H}_{46}C22H46) are hydrocarbons found in, or obtained from, crude oil.
Which statement about these three substances is correct?
They have the same boiling point.
They belong to the same homologous series.
They have the same empirical formula.
They produce different products when completely combusted in excess oxygen.
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