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 Petroleum or Crude Oil. It covers how crude oil is passed through the process of fractional distillation where various fractions of crude oil are separated based on their boiling temperatures. 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.