Which sequence ranks the following isomers in order of increasing boiling points?

Question

Quizplus · Accepted Answer

Isomers 3 and 1 both have hydrogen bonding capabilities, while isomer 2 has only London dispersion forces. Therefore, isomers 3 and 1 will have higher boiling points than isomer 2. Between isomers 3 and 1, isomer 3 has a more linear shape and thus stronger intermolecular forces, leading to a higher boiling point. Therefore, the order of increasing boiling points is 2<1<3, and the best choice is C.

Which Sequence Ranks the Following Isomers in Order of Increasing