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.
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.