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alkene

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Member of the group of hydrocarbons having the general formula CnH2n, formerly known as olefins. Alkenes are unsaturated compounds, characterized by one or more double bonds between adjacent carbon atoms. Lighter alkenes, such as ethene and propene, are gases, obtained from the cracking of oil fractions. Alkenes readily take part in addition reactions, and many useful compounds, such as polythene and bromoethane, are made from them.

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