Answer
a. Heptane has the higher boiling point.
b. Cyclopropane has the higher boiling point.
c. Hexane has the higher boiling point.
Work Step by Step
a. 'pent' = 5 carbons; 'hept' = 7 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.