any gas in a group that contains carbon and hydrogen atoms, with the carbon atoms joined together in a double bond :

]]>https://definedictionarymeaning.com/topic/239373/alkenesRSS for NodeThu, 04 Jun 2026 08:13:42 GMTThu, 23 Sep 2021 09:25:15 GMT60any 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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