This video lecture from Fundamental Principles of Organic Chemistry (F.Sc. second year Chemistry) is a continuation to the last lecture on Structural Isomerism. It is the phenomenon in which to organic compounds have same molecular formulas but different structures. The various types including functional group isomerism, metamerism and tautomerism are discussed in detail with examples. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.