С --> CH4 --> CH3Cl --> C2H6 --> C2H5Br --> C4H10 --> CH2Br2 --> C4H8 --> CO2
C + 2H2 = CH4
CH4 + Cl2 = CH3Cl + HCl
2CH3Cl + 2Na = C2H6 + 2NaCl
C2H6 + Br2 = C2H5Br
2C2H5Br + 2Na = C4H10 + 2NaBr
C4H10 ----- > CH4 + C3H6
CH4 + 2Br2 = CH2Br2 + 2HCl
CH2Br2 + C3H6Br2 + 2Na = C4H8Br2 + 2NaBr
C4H8Br2 + Zn = C4H8 + ZnBr2