This video lecture from Aliphatic Hydrocarbons (F.Sc. second year Chemistry) covers: What are the numerals in chemistry which help us do counting of carbon atoms in a straight chain hydrocarbon. Starting from a single carbon numeral i.e. meth- group up till nine thousand carbon atoms i.e. nonilia-, this method will help you count up any size of hydrocarbon. Examples have been discussed including OctaTetracontaTrictaDili-ene which develop an interesting insight into how complex Aliphatic hydrocarbons are cut down into bits. 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.