Reaction with hydrogen halides: Alcohols react with hydrogen
halides to form alkyl halides (Refer Unit 6, Class XII) ROH + HX  ®  R–X + H2O
The difference in reactivity of three classes of alcohols with HCl
distinguishes them from one another (Lucas test) Alcohols are soluble
in Lucas reagent (conc HCl and ZnCl2) while their halides are immiscible
and produce turbidity in solution