C2H2+H2-->C2H4
C2H4+HCL-->C2H5CL
C2H5CL-->C2H4+HCL
C2H4+h2O-->C2h5OH
C2H5OH-->C2H4+H2O
C2H4+Br2-->C2H4Br2
C2H4Br2-->C2H4+Br2
C2H4+H2-->C2H6
C2H6+CL2-->C2H5CL+HCL
2C2H5CL+2Na-->C4H10+2NaCL
C4H10--> CH2=CH-CH2-CH3+H2
CH2=CH-CH2-CH3 -->CH2=CH-CH=CH2
nСH2=CH-CH=CH2 -->( - CH2-CH=CH-CH2-)n