Question

Plz explain lucas test, victor meyer test and hinsberg test.

Answer 1

The Lucas reagent contains zinc chloride and hydrochloric acid. When the Lucas reagent is allowed to react with an alcohol, an alkyl halide is formed. This alkyl halide will not be soluble in water, thus cloudiness or a second layer of droplets will form if the test is positive. With this reagent, tertiary alcohols react immediately, secondary alcohols in 3 to 10 minutes, and primary alcohols may take an hour or longer, or may never react.



R-OH  +  HCl     R-Cl   +  H2O

     (insoluble)

Hinsberg Test

-  Based on the reaction of the amine with benzenesulfonylchloride and can be used to distinguish among 1o, 2o, and 3° amines.-  1° amines: give solution that produce ppt after addition of HCl