同分异构:( somers CH3CH2CH2CH2 IE( n-butyl CH3--CH-CH2- (iso-butyl CH3 3 CH3-CH 叔(t-buty) CH3 3 CH3CHC2新(neo- penty CH3CH3 CH2 CH2 CH2 正 ( n-butyl.) CH CH3 CH3 CH2 异 ( iso- butyl) 同分异构：(Isomers) CH CH3 CH3 叔 (t- butyl) CH3 CH CH3 CH3 CH2 CH3 新 （neo-pentyl)