The correct answer is-—sch 3>；; —CH2Br & gt； —ccl 3 & gt； —& gt； —cooch 3 & gt； —CH2OH & gt； —ch2nh 2 & gt； CHDCH3 & gt—ch 2 CHD ch 3 & gt； —ch 2ch2 ch 3 & gt； —CH2CH3

Because the comparison of group size is sorted according to the sequence rules, the number of atoms directly connected is large, and the number of atoms of S is greater than that of C, so -sch 3 ranks first with the same number of atoms. Until the size comparison, it is regarded as being connected to this atom twice when encountering a double bond, and an isotope is a big group.