Lucas Test (Distinction between $$1^\circ, 2^\circ, 3^\circ$$ Alcohols)

Reagent: Conc. $$\text{HCl} + \text{Anhydrous ZnCl}_2$$ (Lucas Reagent).

$$3^\circ \text{ Alcohol} \implies \text{Turbidity appears immediately}$$

$$2^\circ \text{ Alcohol} \implies \text{Turbidity appears within 5 minutes}$$.

$$1^\circ \text{ Alcohol} \implies \text{No turbidity at room temperature; appears on heating}$$.