3.完成下列转变 COOH 解 (1)C2Hs Mg H Br (1)CO2 COOH (2)H2O,H C2H C2H5于醚 2)H,O, H ChS OH CH,COOH CHa CH,OH 解 KMnO Br C CHz CH2OH CH,COOH + CH2CICOoH H2So CH,BrCooC,H OH CH,COOH →CH2COC2Hs (2)H3O InR