单词	alkene
释义	English American alkenenoun [ C ] uk/ˈæl.kiːn/us/ˈæl.kiːn/specialized any gas in a group that contains carbon and hydrogen atoms, with the carbon atoms joined together in a double bond: Ethene and propene are alkenes. Thesaurus: synonyms and related words Chemicals, chemical compounds & gases acrolein adenine aldehyde alkaline earth metal alkane ammonia ammonium butane calcium sulphate carbon monoxide iodide lye nitrate octane paraben phenolphthalein potassium permanganate sodium chloride starch sulphur dioxide See more results » alkenenoun [ C ] /ˈælˌkin/ chemistry any of a group of substances that contain only the elements carbon and hydrogen, which are held together by a chemical bond in which two atoms share two pairs of electrons
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