12.18. Give a brief description of the principles of the following techniques taking an example in each case.
It is one of the extensive methods for the separation and purification of organic compounds. It is based on the difference in the movements of components of mixtures through the stationary phase under the influence of the mobile phase. The stationary phase can be solid or liquid. While the mobile phase is only liquid or gas. For example- This technique can separate a mixture of blue and red ink.