If one atom is above another, it shall be deemed that a single bond is present. In cases where a compound cannot be drawn clearly with the compact notation, the second form will be used instead. The smaller alkane chains are more useful. Petrol is an alkane, and is used for fuel. This processed is used in processing crude oil.
Alkenes undergo addition reactions usually by electrophilic reagents.
Alkenes are extremely useful chemicals because of the variety of compounds that can be made from them. Alchohol , e.g. Ethanol. The following chemicals are produced by reactions mentioned above but are not listed separately. Up to my Academic Projects Page . Up to my Home Page .