Rank the molecules from highest boiling point to lowest boiling point.

Question

Arrange the molecules in order of decreasing boiling point.

H2 HBr C2H50H

Answer 1

Intermolecular forces (IMF)

H₂ has dispersion

HBr has dipole-dipole

C₂H₅OH has hydrogen bonding

Order of decreasing boiling point (strongest IMF will have highest b.p.)

C₂H₅OH > HBr > H2