Why are London forces weaker than Permanent Dipole forces?

Question

As far as I understand, in London forces, all molecules are aligned favourably so it makes sense that they should be stronger than Permanent dipole forces as the random movement of molecules will not always produce a favourable interaction. However, every source I’ve checked online says that London forces are the weakest Van set Wall force.

In: Chemistry

Answer 1

LDF’s are incredibly slight and temporary alignments of electron motions.You can imagine them like super tiny dipoles forming by chance and causing the slightest attractions. Permanent dipoles are dipoles which are way wider and with more charge.