а)2CH4 = C2H2 + 3H2;
3C2H2 = C6H6;
C6H6 + Cl2 (FeBr3) = C6H5Cl + HCl;
C6H5Cl + CH3Cl + 2Na = C7H8 + 2NaCl
б) aCO3+3C ->CaC2+3CO (t)
CaC2+2H2O -> Ca(OH)2+C2H2
C2H2+H2 -> C2H4 (t, Ni)
C2H4+HCl ->C2H5Cl
2C2H5Cl+2Na -> C4H10+2NaCl (t)
в) H4 + Cl2 = CH3Cl + HCl
2CH3Cl + 2Na = C2H6 + 2NaCl
С2H6 + Cl2 = C2H5Cl + HCl
C2H5Cl + CH3Cl +2Na = C3H8 + 2NaCl
С3H8 + Cl2 = C3H7Cl + HCl
2C3H7Cl + 2Na = C6H14 + 2NaCl
C6H14 + 2Cl2 = C6H12Cl2 + 2HCl
C6H12Cl2 + 2Na = C6H12 + 2NaCl
C6H12 = C6H6 + 3H