Which statement is true about intramolecular forces?

• A. They are generally stronger than intermolecular forces
• B. They occur between different molecules
• C. They determine the state of matter
• D. They involve only London dispersion forces

Answer: (A)

Intramolecular forces are the bonds that hold atoms together inside a molecule, and they are typically much stronger than the forces between separate molecules. Covalent bonds in molecules, ionic bonds in salts, and metallic bonds in metals all require a lot of energy to break because they involve actual bond formation or electron transfer between atoms. In contrast, the forces that act between different molecules—London dispersion forces, dipole–dipole interactions, and hydrogen bonds—are comparatively weak attractions that govern how substances come together or separate as a whole.

So the statement that intramolecular forces are generally stronger than intermolecular forces is true because breaking the bonds inside a molecule (covalent, ionic, or metallic) is much harder than pulling molecules apart from each other.

The state of matter is mainly determined by the strength of intermolecular attractions and temperature; intramolecular bonds stay intact during phase changes. Also, intramolecular forces are not limited to London dispersion forces—they include covalent, ionic, and metallic bonds, which is why that latter claim isn’t correct.