Цепочка превращений : 1)ch4-> c2h6-> c2ĥ4-> ch3coh-> c2h5oh-> ch3cooh. 2)cac2-> c2h2-> ch3coh-> ch3cooh-> ch3cooc2h5.

CH4 + Cl2 ---> CH3Cl + HCl
2CH3Cl + 2Na ---> CH3-CH3 +2NaCl
CH3-CH3 ---> CH2=CH2 +H2
CH2-CH2 + H2O ---> CH3-CH2-OH
 5 CH3-CH2-OH + 4 KMnO4   + 6  H2SO4 = 5 CH3 -COOH +4MnSO4 +2 K2SO4 + 11H2O