AP BIOLOGY

Detailed explanation-1: -Any molecule which has a hydrogen atom attached directly to an oxygen or a nitrogen is capable of hydrogen bonding. Such molecules will always have higher boiling points than similarly sized molecules which don’t have an-O-H or an-N-H group.

Detailed explanation-2: -As you would expect, the strength of intermolecular hydrogen bonding and dipole-dipole interactions is reflected in higher boiling points.

Detailed explanation-3: -Because hydrogen bonds are rather strong intermolecular interactions, breaking them requires a great deal of energy. This is why water has a high boiling point: breaking the intermolecular interactions that hold water molecules together requires a lot of heat (energy).

Detailed explanation-4: -The high melting and boiling point of the compound containing hydrogen bonds is due to the fact that some extra energy is needed to break these bonds.