This video lecture from Fundamental Principles of Organic Chemistry (F.Sc. second year Chemistry) covers a brief introduction to the natural sources of organic compounds, in particular Natural Gas. The lecture includes the various theories related to the origin of natural gas i.e. thermogenic, biogenic and abiogenic sources. It includes the composition of natural gas as lower alkanes and also its dependence on the area from where it is extracted. The relationship between energy content of natural gas and other fuel sources is also discussed. 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.