easechemistry

London dispersion forces or instantaneous dipole induced dipole forces originate among non polar molecules. These are the weakest forces among intermolecular forces  How London Forces Originate? All atoms and molecules have constant moving electrons around nucleus - in non polar molecules these electrons are evenly distributed called symmetrical distribution- when 1st non polar molecule with symmetrical distributed electrons by chance get disturb and  gain position in such a way that molecules become dipole- these will be called unsymmetrical electron distribution. Now this 1st molecule is having instantaneous dipole. This molecule will induce Dipole in nearby molecule by attracting its electrons towards its instantaneous positive pole. In this way 2nd molecule will generate induced Dipole. Hence these forces are also known as instantaneous Dipole Induced Dipole Forces. Pictorial description of London Forces. Strength of London forces: Strength of London forces depends on siz...