This video lecture from Aromatic HydroCarbons (F.Sc. second year Chemistry) covers: the Huckle’s rule which dictates the Aromaticity of hydrocarbons. Hydrocarbons have been classified in detail and later the Huckle’s rule has been explained which is based on molecular orbital theory. A hydrocarbon is said to be aromatic if its structure is that of Annulene (cyclic structure with alternate double bonds), and further it is planar geometry with odd number of double bonds. 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.