решиь

1)2CH4---1500t-C---C2H2+3H2

 HCCH--- H2 ---H2C=CH2--- H2 ---H3C-CH3.это C2H6.

 2C2H6+7O2=4CO2+6H2O

3)

1)C2+4H2=2CH4

2)CH4+Cl2=CH3Cl+HCl

3)CH3Cl+       (не знаю как)

4)C2H6+Cl2=C2H5Cl+HCl

1)   2CH4---1500t-C---C2H2+3H2

HCCH--- H2 ---H2C=CH2--- H2 ---H3C-CH3.это C2H6.

2C2H6+7O2=4CO2+6H2O

3)  С + 2H2 = CH4 

CH4 + Cl2 = CH3Cl + HCl 
2CH3Cl + Zn = C2H6 + ZnCl2 
C2H6 = C2H4 + H2 
C2H4 + HCl = C2H5C