What is the major type of force that must be overcome to allow each of the processes below? I. the evaporation of propanal (CH₃CH₂CH₂OH) II. the boiling of liquid CH₂Cl₂ III. the melting of solid Br₂ IV. the boiling of liquid BF₃ A) hydrogen bonding, London forces, dipole-dipole, dipole-dipole B) hydrogen bonding, dipole-dipole, London forces, London forces C) dipole-dipole, dipole-dipole, London forces, London forces D) London forces, covalent bonding, dipole-dipole, dipole-dipole E) London forces, London forces, London forces, London forces

Question

Quizplus · Accepted Answer

I. The evaporation of propanal requires the breaking of hydrogen bonds between the molecules, which is the strongest intermolecular force it exhibits.
II. The boiling of liquid CH3Cl requires the breaking of dipole-dipole forces, which is weaker than hydrogen bonding but stronger than London forces.
III. The melting of solid Br2 requires the breaking of London forces between the molecules.
IV. The boiling of liquid BF3 requires the breaking of dipole-dipole forces between the molecules. Thus, option B, which lists the required forces in the correct order, is the correct answer.

What Is the Major Type of Force That Must Be