Lucas’ reagent

What is Lucas’ reagent?

The Lucas’ reagent is prepared by dissolving ZnCl2 in concentrated HCl and is used to identify alcohols. A chloroalkane is formed and the solution turns from clear to cloudy, indicating the presence of an alcohol.


Lucas, H. J. (1930). “A New Test for Distinguishing the Primary, Secondary and Tertiary Saturated Alcohols“. Journal of the American Chemical Society. 52 (2): 802–804
DOI: 10.1021/ja01365a053.