Benzene: acylation physical properties

Identification of Alkyl Halides.—On account of their relative inertness at ordinary temperatures the alkyl halides are usually identified by the determination of their physical properties. They are insoluble in concentrated sulphuric acid, and, unlike the acyl halides, they do not react readily with water and alcohols. Unlike the compounds in which halogen is joined to nitrogen, they are not easily changed by an aqueous solution of sodium hydroxide. They are distinguished from many halogen derivatives of benzene and related hydrocarbons, which will be described later, by the fact that they are decomposed when boiled with an alcoholic solution of potassium hydroxide —... 

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