Answer
a. Butane
b. Cyclohexane
c. Heptane
Work Step by Step
a. 'prop' = 3 carbons; 'but' = 4 carbons
Greater number of carbons: Greater boiling point.
b. Cycloalkanes with the same number of carbons have a higher boiling point than the straight-chain alkane form.
c. These are isomers.
More branches = Lower boiling point.