A:CH3COOH+CH3CH2OH ⇌△浓H2SO4 CH3COOCH2CH3+H2O
B:2CH3CH2OH+O2 2CH3CHO+2H2O
C:CH3CH2Br+NaOH →H2O CH3CH2OH+NaBr
D: +Br2 →FeBr3 +HBr