Whether an alcohol is primary, secondary or tertiary can be determined by taking advantage of the relative rates at which the three classes of alcohols react with HCl/anhydrous ZnCl₂. This is known as Lucas test. The alcohol is added to a mixture of concentrated HCl and anhydrous ZnCl₂ (the Lucas reagent). Low molecular weight alcohols are soluble in the Lucas reagent, but the alkyl halide products are not, so the solution turns cloudy as the alkyl halide is formed. When the test is carried out at room temperature, the solution turns cloudy immediately if alcohol is tertiary, in about five minutes if the alcohol is secondary, and remains clear if the alcohol is primary. Because test relies on the complete solubility of the alcohol in the Lucas reagent, it is limited to alcohols with fewer than six carbon atoms. Now, the answer following questions: