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Alkenes are unsaturated hydrocarbons with at least one carbon-carbon double bond. Their general formula is CnH2n. They are also called as olefins. The first stable member of alkene series is ethene, which is commonly known as ethylene. Ethene can be prepared in the laboratory by dehydration of ethyl alcohol in presence of sulfuric acid. Ethene is colourless and inflammable gas having a faint sweet odour. It is sparingly soluble in water but highly soluble in organic solvents. Alkenes undergo addition reactions, ozonolysis, polymerization, oxidation and combustion reactions.

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