Thus, CFC-12 may also be written as R-12 or Refrigerant 12.An alkene, olefin, or olefine is an unsaturated compound containing at least one carbon-carbon double bond.
ðˈʌs, sˌiːˌɛfsˈiː twˈɛlv mˈeɪ ˈɔːlsoʊ biː ɹˈɪʔn̩ æz ˈɑːɹ twˈɛlv ɔːɹ ɹᵻfɹˈɪdʒɚɹənt twˈɛlv.ɐn ˈælkiːn, ˈoʊlfɪn, ɔːɹ ˈoʊlfaɪn ɪz ɐn ʌnsˈætʃɚɹˌeɪɾᵻd kˈɑːmpaʊnd kəntˈeɪnɪŋ æt lˈiːst wˈʌn kˈɑːɹbəŋkˈɑːɹbən dˈʌbəl bˈɑːnd.