The simplest isomer of an alkane is the one in which the carbon atoms are arranged in a single chain with no branches.
ðə sˈɪmpəlɪst ˈaɪsəmɚɹ əvən ˈælkeɪn ɪz ðə wˈʌn ɪnwˌɪtʃ ðə kˈɑːɹbən ˈæɾəmz ɑːɹ ɚɹˈeɪndʒd ɪn ɐ sˈɪŋɡəl tʃˈeɪn wɪð nˈoʊ bɹˈæntʃᵻz.