119 



Theory. Experiment. Portion distilled. 



I. II. 



C 18 58-54 59-70 .. 58-69 



H 9 .... 4-87 5-01 5-31 



O 4 .... 17-35 .. .. * %'. 



Cl.... 19-24 ;; T. ' 17-93 ;;lv; 



100-00 



The portion not distilled contained doubtless a trace of free ben- 

 zoic acid, which would affect the carbon and chlorine, but not the 

 hydrogen. 



Chlor-benzoate of glycol, as I shall call this compound, has a 

 pungent and somewhat bitter taste. It is insoluble in water, but 

 freely soluble in alcohol and ether. Boiling solution of potash 

 effects its decomposition with difficulty, solid potash readily, the re- 

 action being the same as in the case of the analogous compounds. 



Action of Hydriodic Acid on Glycol. Formation of Iodide of 

 Ethylene on lodhydrine of Glycol. 



Hydriodic acid gas is absorbed with great energy by glycol. A 

 considerable quantity of heat is evolved during the passage of the 

 gas, and the liquor becomes black and thick from the separation of 

 free iodine. On removing the iodine by means of dilute potash, a 

 mass of small white crystals is brought to light, which I at once 

 suspected to be iodide of ethylene. To remove all doubt on this 

 point, I submitted the crystals to analysis, having previously purified 

 them, by recrystallizing from boiling alcohol. The numbers ob- 

 tained agree with the formula of iodide of ethylene : 



Theory. Experiment. 



C 4 .... 8-51 8-73 



H 4 .... 1-42 1-78 

 I, . 90-07 



100-00 



The reaction which causes the formation of iodide of ethylene may 

 be thus explained : 



That the action of hydriodic acid on glycol should be different 



K 2 



