Answer to Question #154463 in General Chemistry for ebene

Question

What is the difference between a permanent molecular dipole in a polar molecule and an induced dipole in a non polar molecule?

Answer 1

a permanent molecular dipole in a polar molecule :

A permanent dipole is when you have a polar molecule with oppositely charged ends, and these ends attract other polar molecules, bonding them together. The polar molecules will always be slightly negative on one end and slightly positive on the other. The slightly negative attracts the slightly positive on another molecule, and the slightly positive attracts the slightly negative on another molecule. Therefore, they bond together. (Permanent dipoles are found in the dipole-dipole forces.)

an induced dipole in a non polar molecule :

The London dispersion force is the weakest intermolecular force. The London dispersion force is a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles. This force is sometimes called an induced dipole-induced dipole attraction. London forces are the attractive forces that cause nonpolar substances to condense to liquids and to freeze into solids when the temperature is lowered sufficiently.