Based on the molecular formula, determine if each compound is an alkane, alkene, or alkyne. (Assume that all the compounds are noncyclic and do not contain more than one multiple bond.)
(a) $\quad \mathrm{C}_{3} \mathrm{H}_{6}$
(b) $\mathrm{C}_{6} \mathrm{H}_{10}$
(c) $\mathrm{C}_{3} \mathrm{H}_{8}$
(d) $\mathrm{C}_{5} \mathrm{H}_{10}$