This video lecture from Fundamental Principles of Organic Chemistry (F.Sc. second year Chemistry) covers Structural Isomerism. It is the phenomenon in which to organic compounds have same molecular formulas but different structures. The various types including position isomerism (in which skeletal formulae is same) and chain isomerism (in which skeletal formulae changes) 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.