Which of the following statements correctly describes dipole-dipole forces?

• A. They are the strongest type of intermolecular force present in all substances.
• B. They only occur in ionic compounds.
• C. They occur between polar molecules due to the attraction of positive and negative ends.
• D. They are responsible for the boiling point elevation in nonpolar compounds.

Answer: (C)

Verified step by step guidance

1. Understand that dipole-dipole forces are a type of intermolecular force that occur between molecules with permanent dipoles, meaning the molecules are polar.
2. Recall that dipole-dipole forces arise because the positive end of one polar molecule is attracted to the negative end of another polar molecule.
3. Recognize that dipole-dipole forces are not the strongest intermolecular forces; for example, hydrogen bonding and ionic interactions can be stronger.
4. Note that dipole-dipole forces do not occur in ionic compounds, as those involve ionic bonds, nor do they occur in nonpolar compounds, which lack permanent dipoles.
5. Conclude that the correct description of dipole-dipole forces is that they occur between polar molecules due to the attraction of positive and negative ends.