1) CH4 + Cl2 -> CH3Cl + HClCH3Cl + Na -> CH3Na + NaClCH3Na + Br2 -> CH3Br + NaBr
2) CH3-CH3 -> CH3-CH2-X1 + H2CH3-CH2-X1 -> CH3-CH2-X2 + HXCH3-CH2-X2 -> CH3-CH2-X3 + HX
1) CH4 + Cl2 -> CH3Cl + HCl
CH3Cl + Na -> CH3Na + NaCl
CH3Na + Br2 -> CH3Br + NaBr
2) CH3-CH3 -> CH3-CH2-X1 + H2
CH3-CH2-X1 -> CH3-CH2-X2 + HX
CH3-CH2-X2 -> CH3-CH2-X3 + HX