A) axit axetic+(Cl2, ánh sáng)—>A+(NaOH dư)–>B+(HCl)—>C—>axit oxalic
axit axetic—>D—>E (1500°C, làm lạnh nhanh)—>F—>axit oxalic
B) C4H6 + (Br2, 1:1)—>A + (H2O, OH-, t°)—>B + (CuO, t°)—>E + (O2, Mn, t°)—>F + (NaOH)—>G + (NaOH, CaO, t°)—>etilen
C) O-BrC6H4CH2Br + NaOH dd
D) P-HOCH2C6H4OH + HBr