A CH3CH2CH2COOH; B CH3CH2CHBrCOOH; C CH3CH2CHNH2COOH; D CH3CH2CHOHCOOH
A阳离子; B阴离子; C两性离子; D中性离子
A醛; B醇; C烃; D羧酸
A乙醇; B乙醛; C丙酮; D正丙醇
A CH3CHO; B CH3CH=CH2; C CH3COCH3; D CH3COOH