Thin layer chromoatography \((TLC)\) is another type of adsorption chromatography, which involve sepration of substance of a mixture ovel a thin layer of an adsorbent coated on glass plate. A thin layer (about \(0.2\,mm\) thick) of an adsorbent (silica gel) or (Alumina) in spread overa glass plate of suitable size. Hence Assertion \((A)\) is correct and Reason \((R)\) is correct explanation of \((A)\)