114 ETHYLENE SERIES. 



one, two, three, or all the hydrogen atoms can be re- 

 placed by chlorine. These chlorinated products con- 

 duct themselves towards alcoholic potassa like ethylene 

 chloride ; a molecule of hydrochloric is given off, and 

 in this way are formed the two series : 



The first three members are different from the sub- 

 stitution-products (p. 46) obtained from ethyl hydride 

 or ethyl chloride by the action of chlorine ; for the 

 fourth and fifth members there is but one kind of 

 constitution possible. 



Ethylene bromide, C 2 H 4 Br 2 , a colorless liquid, 

 boiling at 129, congealing at a temperature below + 9, 

 is formed by conducting ethylene into bromine under 

 water. It conducts itself towards an excess of bromine 

 and towards an alcoholic solution of potassa like the 

 chloride. In this way are obtained the two series : 



C 2 H 4 Br 2 ; boiling point, 129 

 C 2 H 3 Br 3 " " 186.5 



l not distilla ? without 



C 2 B fi r so ^ \ decomposition. 



And 



C 2 H 3 Br ; boiling point, 23-24 



" 130 

 C 2 Br 4 ; fusing point, 50 



Ethylene iodide, C 2 H 4 I 2 , is produced by conduct- 

 ing ethylene gas over iodine in sunlight at an elevated 



