Crossword clue: any one of three metameric hydrocarbons, c4h8, of the ethylene series. they are gaseous or easily liquefiable.
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Possible answers
any of three isomeric hydrocarbons C4H8; all used in making synthetic rubbers
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Similar clues
any one of a series of metameric, unsaturated hydrocarbons c9h18 of the ethylene series.
50% similar
→ nonylene