1) CH4+Cl2=CH3Cl+HCl
2) 2CH3Cl+2Na=CH3-CH3+2NaCl
3) CH3-CH3+Br2=CH3CH2Br+HBr
4) 2CH3-CH2Br+2Na=CH3-CH2-CH2-CH3+2NaBr
1) CH4+Cl2=CH3Cl+HCl
2) 2CH3Cl+2Na=CH3-CH3+2NaCl
3) CH3-CH3+Br2=CH3CH2Br+HBr
4) 2CH3-CH2Br+2Na=CH3-CH2-CH2-CH3+2NaBr