# Intermolecular forces of attraction strongest to weakest?

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141
Jun 10, 2016

From strongest to weakest, the intermolecular forces rank in the following way:

• Strongest: Hydrogen bonding. This occurs when compounds contain $\text{O"-"H}$, $\text{N"-"H}$, or $\text{F"-"H}$ bonds. Though referred to as "hydrogen bonding", it's not a real bond but just a really strong intermolecular force.

• Less strong: Dipole-dipole forces. This takes place when polar compounds are attracted to one another.

• Weakest: London Dispersion Forces. This takes place when temporary dipoles on nonpolar molecules attract one another.

Note that intramolecular forces like covalent and ionic bonding are still much stronger than any form of intermolecular bonding.

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49
Nov 25, 2014

Basically there are 5 types of intermolecular forces.

1. Ion-dipole interactions
2. Dipole-dipole interactions
3. Ion-induced interactions
4. Dipole-induced interactions
5. Induced-induced interactions/London forces/Dispersion forces

Among these we can't directly say which is the strongest .It depends on the atoms connected with the bond(specially the electro negativity).But we can generalize an order.But this is not always correct.

Ion-dipole>dipole-dipole>ion-induced>dipole-induced>London forces.

But sometimes dipole-dipole interactions are higher than ion-dipole.If the electro negativity of atoms participating in the bond are more electronegative then that bond is relatively more stronger.H bonds are a type of dipole-dipole interactions but they contain F,O,N in one end.

NOTE-In some books they say that electrostatic forces of ionic compounds are also a type of inter molecular forces.In such cases the strongest is that.

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35
Nov 19, 2015

Ion-dipole > H-bond > dipole-dipole > ion-induced dipole > dipole-induced dipole > London Dispersion Force

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London Dispersion Force is the weakest because there is no definite position of electrons overtime. It is also called instantaneous dipole- induced dipole.

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