1) CH4 + Cl2 -> CH3Cl + HCCH3Cl + Na -> CH3Na + NaCCH3Na + Br2 -> CH3Br + NaBr
2) CH3-CH3 -> CH3-CH2-X1 + HCH3-CH2-X1 -> CH3-CH2-X2 + HCH3-CH2-X2 -> CH3-CH2-X3 + HX
1) CH4 + Cl2 -> CH3Cl + HC
CH3Cl + Na -> CH3Na + NaC
CH3Na + Br2 -> CH3Br + NaBr
2) CH3-CH3 -> CH3-CH2-X1 + H
CH3-CH2-X1 -> CH3-CH2-X2 + H
CH3-CH2-X2 -> CH3-CH2-X3 + HX