NERSITY O 通式:c n2n-2 (n≥3) 同分异构:C5H8 CH3 CH, CH,C=CH CH3CH2=CH—CH=CH2◼ 通式：CnH2n-2 （n≥3) ◼ 同分异构：C5H8 CH3CH2 CH CH3CH2CH2 C CH CH CH2