2-丙醇CH3-CH(OH)-CH3合成1,2-丙二醇CH3CHOH-CH2OH时,可用逆推法判断,即CH3CHOHCH2OH→CH3CHBrCH2Br→CH3CH=CH2→CH3CHOHCH3,则2-丙醇应首先发生消去反应生成CH3CH=CH2,CH3CH=CH2发生加成反应生成CH3CHBrCH2Br,CH3CHBrCH2Br发生水解反应可生成1,2-丙二醇,故选:C.