А)2C+2H2-->2CH4 CH4+Cl2-->CH3Cl+HCl
2CH3Cl+2Na-->CH3-CH3+2NaCl CH3-CH3-->(-H2) CH2=CH2
CH2=CH2+2KMnO4+4H2O-->2KOH+2MnO2+3CH2OH-CH2OH
Б)2CH4-->HC(тройная)CH+3H2
HC(тройная связь)CH+2H2-->CH3-CH3
CH3-CH3-->(-H2)CH2=CH2+H2
CH2=CH2+Cl2-->CH2Cl-CH2Cl
CH2Cl-CH2Cl+2Na-->CH2=CH2+2NaCl CH2=CH2+H2O
-->CH2OH-CH2OH