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Question

Which of the following reagents could be used to distinguish between propan-2-ol and tert-butyl alcohol?



Correct Answer
A

Lucas reagent

Correct Answer
B

ZnCl2 and HCl

Correct Answer
C

A Cr(VI) reagent like H2CrO4

Your Answer
D

Bromine water


Solution

The correct options are
A

Lucas reagent


B

ZnCl2 and HCl


C

A Cr(VI) reagent like H2CrO4


In other words, distinguish between a tertiary alcohol and a secondary alcohol. Using a Chromium VI
compound can oxidize primary alcohols and secondary alcohols and in the process,
the reagent loses its orange colour. The tertiary alcohol does not react with Jones’ reagent.

The Lucas test is positive for the tertiary alcohol very quickly as compared to the secondary alcohol.
The time difference can help identify which is which. The top two options are equivalent.

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