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Question

Chemistry Question on Alcohols, Phenols and Ethers

Lucas test is used for the determination of

A

alcohols

B

alkyl halides

C

phenols

D

aldehydes

Answer

alcohols

Explanation

Solution

Lucas test - Alcohol reacts with concentrated hydrochloric acid in presence of anhydrous ZnCl2ZnCl _2 to form alkyl halides. The three type of alcohols undergo this reaction at different rates. Order of rate of reaction is : tertiary > secondary > primary. R−OH+HCl−>[ZnCl2]R−Cl+H2OAlkyl chlorideR - OH + HCl {->[{ZnCl _{2}}]} \underset{\text{Alkyl chloride}}{R - Cl + H _{2} O}