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Which of the following compounds has the lowest boiling point?

(a) ${\mathrm{CH}}_{3}{\mathrm{CH}}_{2}{\mathrm{CH}}_{2}{\mathrm{CH}}_{2}{\mathrm{CH}}_{3}$

(b) ${\mathrm{CH}}_{3}\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_{2}{\mathrm{CH}}_{3}$

(c) ${\mathrm{CH}}_{3}\mathrm{CH}=\mathrm{CH}-\mathrm{CH}={\mathrm{CH}}_{2}$

(d) ${\mathrm{CH}}_{3}{\mathrm{CH}}_{2}{\mathrm{CH}}_{2}{\mathrm{CH}}_{3}$