Alkenes are unsaturated hydrocarbons with atleast 1 C=C double bond.
- Aliphatic alkenes with one double bond have the general formula: C H
- Alkenes are more reactive than alkanes, and typically take part in addition reactions
- Alkenes can form E/Z isomers, including cis-trans isomers
Ethene is a very important alkenes. It is obtained from the cataytic cracking of crude oil fractions. Ethene is used to make polymers for the plastics industry. The C=C bond is the functional group in an alkene and is responsible for its reactions.
The nature of the double bond
The C=C double bond is made up from two parts; a sigma, , bond and a pi, , bond, -bonds are also present in alkanes.
In the formation of the double bond:
- A -bond is formed directly between two carbon atoms by the overlap of orbitals. Each carbon atom contributes one electron to…