Viscosity of a liquid arises due to strong intermolecular forces existing between the molecules. Stronger the intermolecular forces, greater is the viscosity. Name the intermolecular forces existing in the following liquids and arrange them in the increasing order of their viscosities. Also give reason for the assigned order in one line.
Water, hexane , glycerine
The increasing order of viscosity is
hexane < water < glycerine
Reason. In hexane, there are only London forces whereas in water and glycerine, there is hydrogen bonding which is stronger in case of glycerine (because of the presence of three —OH groups) than that in water.