Strongest force

[annikaying]

Which intermolecular force is strongest? I though it was hydrogen bonding, but now I'm wondering if intermolecular forces involving ions are stronger.

[Daniel Toscano 1L]

I think generally for small molecules, hydrogen bonds are the strongest, then dipole-dipole, and London dispersion forces as the weakest. However, as the size of the molecule increases, London dispersion forces can dominate over other forces.
I'm not sure if ion-dipole forces are considered an intermolecular force as an ion is an atom, not a molecule.

[Izzie Capra 2E]

Ion-ion and ion-dipole forces are stronger because they exhibit ionic character, which is the strongest kind of force. The bonds will be hardest to break in this case. After these forces, then hydrogen bonds are strongest, then dipole-dipole, then LDFs.

[Audrie Chan-3B]

In terms of strength, ion-ion > ion-dipole > hydrogen-bond > dipole-dipole > london dispersion.

[Eunice Nguyen 4I]

From TA's notes: ion-ion > ion-dipole > hydrogen bond(strong dipole) > dipole-dipole > dipole-induced dipole > induced dipole-induced dipole

[Jenna Ortiguerra 4G]

The increasing strength of the intermolecular forces can be seen through: induced dipole-induced dipole < dipole-induced dipole < dipole-dipole < hydrogen bond (hydrogen bonding is a stronger form of dipole bonding because it requires a highly electronegative element (F, O, N) with hydrogen, therefore forming a stronger bond) < ion-dipole < ion-ion.

[Janet Nguy 2C]

I agree with everyone before me, but to add on: Hydrogen-bonding is the third strongest intermolecular force because when Hydrogen reacts with a highly electronegative atom (N, O, F) it will act as a very strong dipole and will be stronger than the average dipole-dipole interaction.