Question

ch4-hcoh-ch3oh-ch3cl-c2h6-c2h5oh-ch3cooh-ch3cooch

Answer 1

CH4 + 2[O]-->HCOH + H2O; HCOH + H2--->CH3OH; CH3OH + HCl-->CH3Cl + H2O;
2CH3Cl + 2Na---> C2H6 + 2NaCl; C2H6 + [O]-->C2H5OH; C2H5OH + 2[O]-->CH3COOH + H2O;
CH3-COOH + NaOH-->CH3COONa + H2O; CH3COONa + NaOH-->CH4 + Na2CO3.