Which intermolecular force is strongest among the following?

Which intermolecular force is strongest among the following?

• A. Dipole-Dipole
• B. Hydrogen Bonding
• C. London Dispersion Forces
• D. Ion-Dipole Forces

Answer: (B)

Hydrogen bonding stands out because it creates a strong, highly directional attraction when a hydrogen atom is bonded to a highly electronegative atom (nitrogen, oxygen, or fluorine) and interacts with a lone pair on another molecule. This interaction is much stronger than ordinary dipole–dipole forces, which rely on the alignment of permanent dipoles but don’t have the extra stabilization from sharing that a hydrogen bond provides. London dispersion forces come from temporary dipoles and are generally weaker, especially for small to medium molecules. Ion–dipole forces can be very strong, but they require the presence of free ions; in systems without ions, hydrogen bonding is the strongest option among those listed.

Hydrogen bonding stands out because it creates a strong, highly directional attraction when a hydrogen atom is bonded to a highly electronegative atom (nitrogen, oxygen, or fluorine) and interacts with a lone pair on another molecule. This interaction is much stronger than ordinary dipole–dipole forces, which rely on the alignment of permanent dipoles but don’t have the extra stabilization from sharing that a hydrogen bond provides. London dispersion forces come from temporary dipoles and are generally weaker, especially for small to medium molecules. Ion–dipole forces can be very strong, but they require the presence of free ions; in systems without ions, hydrogen bonding is the strongest option among those listed.