2.阝-卤代酸的反应 有aH NaOH-H2O CH:CH2 CHBrCH,COOH CH,CH,CH=CHCOONa H+ CH:CH2CH=CHCOOH 无a-H CH3 CH3 CH3 3C-C00 NOHCH✉C一G-0H0→CH-C-C00 H20 CH2Br CH2OH2. β-卤代酸的反应 有  -H 无 -H CH3CH2CHBrCH2COOH CH3CH2CH=CHCOOH CH3CH2CH=CHCOONa NaOH-H2O H+ CH3 -C-COOH CH3 CH2Br CH3 -C-COONa CH3 CH2OH CH3C O C=O CH3 H2O NaOH NaOH CCl4