Butane is the most common alkane that is put under the process of isomerization, as it makes many branched alkanes with high octane numbers.
bjˈuːteɪn ɪz ðə mˈoʊst kˈɑːmən ˈælkeɪn ðæt ɪz pˌʊt ˌʌndɚ ðə pɹˈɑːsɛs ʌv ˌaɪsoʊmɹᵻzˈeɪʃən, æz ɪt mˌeɪks mˈɛni bɹˈæntʃt ˈælkeɪnz wɪð hˈaɪ ˈɑːkteɪn nˈʌmbɚz.