Осуществить ряд превращений C--->C2H6--->C2H5CI--->C3H8--->C3H7Br--->C5H12--->CO2
2C+3H2=C2H6 C2H6+Cl2=C2H5Cl+HCl C2H5Cl+CH3CL+2Na=C3H8+2NaCl C3H8+Cl2=C3H7Cl+HCl C3H7Cl+C2H5Cl+2Na=2NaCl+C5H12 C5H12+8O2=5CO2+6H2O