(1)A:HOCH2CH2OH.(乙二醇) B:OHCCHO（乙二醛）
(2)HOCH2CH2OH+HOOCCOOH=C4H4O4(环状，乙二酸乙二酯)+2H2O
A→B→C
R-CH2OH→R-CHO→R-COOH
CH2(OH)CH2OH→OHC-CHO→HOOC-COOH
A，B的结构简式
A:CH3-CH2OH
B:CH3-CHO
1 CH2=CH2+Br2----->CH2BrCH2Br
2 CH2BrCH2Br+2NaOH------>CH2(OH)CH2OH+2NaBr
3 CH2(OH)CH2OH+O2----->OHC-CHO+2H2O
4 OHC-CHO +O2------->HOOC-COOH
5 CH2(OH)CH2OH+HOOC-COOH----浓H2SO4--->C4H4O4+2H2O
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