Цепочки превращения:
1)СH4→CH3CL→C3H8→C3H7CL→C3H6
2)CH4→C2H2→C2H4→C2H5CL→C3H8→C3H6

1) CH4+CL2-->CH3CL+HCLCH3CL + C2H5CL+2Na-->2NaCL+C3H8C3H8+CL2-->C3H7CL+HCLC3H7CL-->  C3H6+HCL2)2CH4-->C2H2+2H2C2H2+H2-->C2H4C2H4+HCL-->C2H5CLC2H5CL+CH3CL+2Na-->C3H8+2NaCLC3H8-->C3H6+H2

CH₄ + Cl₂ (hv)= CH₃Cl + HClCH₃Cl + C₂H₅MgCl = C₃H₈ + MgCl₂C₃H₈ + Cl₂ (hv)= C₃H₇Cl + HClC₃H₇Cl + KOH (C₂H₅OH)= C₃H₆ + KCl + H₂O2CH₄ (t)= C₂H₂ + 3H₂C₂H₂ + H₂ (t,P)= C₂H₄C₂H₄ + HCl = C₂H₅ClC₂H₅Cl + CH₃MgCl = C₃H₈ + MgCl₂C₃H₈ (Ni,t)= C₃H₆ + H₂