Question
What are alkenes ?
Solution
Alkenes are unsaturated hydrocarbons which contain at least one double bond between two carbon atoms 
in their molecules. The alkenes are also called olefins because the lower gaseous members from oily products with chlorine or bromine. The double bond in an alkene is also known as an Ethylenic double bond or Olefinic bond. The general formula of alkene is CnH2n where n = 2,3, 4...... etc. Since there can be no alkene having one carbon (due to the absence of >C = C< double bond), the first member of the series in bond), the first member of the series is C2H4. It is commonly known as ethylene.
When n = 2 C2H4 Ethene (Ethylene)
n = 3 C3H6 Propene (Propylene)
in their molecules. The alkenes are also called olefins because the lower gaseous members from oily products with chlorine or bromine. The double bond in an alkene is also known as an Ethylenic double bond or Olefinic bond. The general formula of alkene is CnH2n where n = 2,3, 4...... etc. Since there can be no alkene having one carbon (due to the absence of >C = C< double bond), the first member of the series in bond), the first member of the series is C2H4. It is commonly known as ethylene.When n = 2 C2H4 Ethene (Ethylene)
n = 3 C3H6 Propene (Propylene)
