Question

An unknown alcohol is treated with "Lucas reagent" to determine wheter the alcohol is primary. Secondary or teritary. Which alcohol reacts fastest and by what mechanism?
A. tertiary alcohol by `S_(N^(1))`
B. secondary alcohol by `S_(N^(1))`
C. tertiary alcohol by `S_(N^(2))`
D. secondary alcohol by `S_(N^(2))`

Answer 1

Correct Answer - A
With Lucas reagent, tertiary alcohol reacts fastest by `S_(N^(1))` mechanism because tertiary carbocation is formed in the rate determining or slow step.