Learn the definition, procedure, observations, mechanism, applications and practice problems of Lucas test, a test to identify primary, secondary and tertiary alcohols using Lucas reagent. Lucas reagent is a solution of anhydrous zinc chloride and hydrochloric acid that reacts with alcohols to form chloroalkanes. Lucas reagent is a solution of zinc chloride and hydrochloric acid used to test and classify alcohols based on their reactivity. Learn how to prepare, use and handle Lucas reagent, and the mechanism of the substitution reaction it undergoes with alcohols. The Lucas Test is a method for distinguishing between primary, secondary, and tertiary alcohols that is performed by mixing Lucas reagent with various alcohols. Lucas Reagent Lucas reagent is a solution of anhydrous zinc chloride (Lewis acid) in concentrated hydrochloric acid. Lucas' reagent is used as a reagent to test alcohols of low molecular weight. Lucas reagent is used to classify alcohols in primary, secondary, and tertiary alcohols according to their reactivity. Lucas reagent is a solution mixture of hydrochloric acid and zinc chloride. To make the Lucas reagent, both of the reacting species, zinc chloride and hydrochloric acid, are taken in ...