(1) $CH_3CHO+ \large\frac{1}{2}\: O_2 \: \underrightarrow { Mn(OAc)/ air}\: CH_3 COOH$
(2) $ CH_3CH_2OH+O_2 \: \underrightarrow {Micoderma\: aceti} \: CH_3COOH+H_2O$
(3) $CH_3MgBr \: CH_3COOH+Mg(OH)Br$
(4)$ CH_3OH+CO\: \underrightarrow {Ca/ \Delta\: pressure}\: CH_3COOH$
