Intermolecular forces are important because they determine the physical properties of substances. Many of the life-sustaining properties of water such as its high heat capacity are a result of the hydrogen bonding capabilities it has and are thus due to intermolecular forces.

How are intermolecular forces used in real life?

Intermolecular forces are essential in our daily lives. Some examples of this include DNA, proteins, plants, and grocery bags.

Are the most important intermolecular forces?

The four compounds are alkanes and nonpolar, so London dispersion forces are the only important intermolecular forces.