Third Series of Hydrocarbons

The hydrocarbons of this series, above the first, form two isomeric series, designated as alpha and Beta. Those of the alpha series are produced by heating the dibromids or diiodids of the olefins with alcoholic solution of KHO. They have the general formula HC=C—CnHsn+i. Those of the Beta series are produced by a variety of reactions, and have the general formula H,C = G = CmH,n. 

It is a colorless gas, rather soluble in HaO has a peculiar, disagreeable odor such as is observed when a Bunsen burner burns within the tube. It forms exiilosive mixtures with 0. It unites with N, under the influence of the electric discharge, to form hy- 

Its presence may be detected by the formation in an ammo-niacal solution of cuprous chlorid of a blood-red precipitate, which is explosive when dry. It is probable that explosions which sometimes occur in brass or copper pipes, through which illuminating gas is conducted, are due to the formation of this compound. 

Cyanogen. Sulfocyanogen. Hydrogen sulfid. Carbon disulfid. Sulfuretted hydrocarbons. 

In passing through the purifiers the gas is freed of the impurities to a greater or less extent, and, as usually delivered to consumers, contains  

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