Lucas test is used to differentiate and categorize primary, secondary and tertiary alcohols using a solution of anhydrous zinc chloride in concentrated hydrochloric acid. This solution is commonly referred to as “Lucas Reagent”. 2-Methyl-2-butonol can be differentiated from 3-methyl-2-butanol using Lucas reagent because: View Solution Lucas test is used to differentiate and categorize primary, secondary and tertiary alcohols using a solution of anhydrous zinc chloride in concentrated hydrochloric acid. This solution is commonly referred to as the Lucas reagent. What is the Lucas Test? 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 ...