how can we determine that which intermolecularforce is stronger

Dear student
First you should know there are how many Intermolecular forces: 

Type of compound Intermolecular forces present Relative order of boiling and melting points
Ionic compounds Ion to ion attraction between ions, London dispersion forces 1, highest)
Covalent compounds containing hydrogen bonds Hydrogen bonds, London dispersion forces 2
Polar covalent compounds Dipole-dipole attraction between dipoles created by partially charged ions, London dispersion forces 3
Nonpolar covalent compounds London dispersion forces 4, lowest


Intermolecular forces are the forces of attraction between atoms in molecules. When atoms react with each other they form molecules and they can even react to form more complex structures. The different intermolecular forces of attraction are hydrogen bonding, ion-induced dipole forces, ion-dipole, and van der Waals forces.

One of the strongest intermolecular forces (i.e. non-covalent) is the H-bond. That is the force responsible for holding water molecules together, and it creates water surface tension.The strongest intermolecular forces of attraction are the hydrogen bonds. It occurs when a hydrogen atom creates a polar bond with a non bonding electron pair of a negative ion.
  1. Less strong: Dipole-dipole forces.
  2. Weakest: London Dispersion Forces.

Hope it is clear
Regards


 

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