Alkenes The hydrocarbons which contain one or more double bonds between carbon atoms. or The hydrocarbons which contain at least one carbon- carbon double bond are called alkenes. They have general formula C2H2n. For example Ethene, Propene, butene, etc Question Write the structural formula for a. 1-Butene b. 2-Butene Solution a. 1-Butene b. 2-Butene Self Assessment Question Draw structural formula of the following compounds a. 1-Pentene b. 2-Pentene Solution General Methods of Preparation of Alkenes Alkenes can be prepared by the following methods 1. By dehydration of Alcohols Removal of water from alcohols is called dehydration of alcohols. When ethanol is passed over heated alumina, dehydration of ethanol occurs to produce ethene. Sulphuric acid can also be used as dehydrating agent e.g. Phosphoric acid (H3PO4) and phosporous pentaoxide can also be used as ...
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