For example, an ethyl group is an alkyl group; when this is attached to a hydroxy group, it gives ethanol, which is not an alkane.
fɔːɹ ɛɡzˈæmpəl, ɐn ˈɛθəl ɡɹˈuːp ɪz ɐn ˈælkaɪl ɡɹˈuːp; wˌɛn ðɪs ɪz ɐtˈætʃt tʊ ɐ haɪdɹˈɑːksi ɡɹˈuːp, ɪt ɡˈɪvz ˈɛθɐnˌɑːl, wˌɪtʃ ɪz nˌɑːt ɐn ˈælkeɪn.