An unknown alcohol is treated with the 'Lucas reagent' to determine whether the alcohol is primary, secondary or tertairy. Which alcohol reacts faster and by what mechanism?

Options

A. Secondary alcohol by `S_(N)^(1)`
B. Tertiary alcohol by `S_(N)^(1)`
C. Secondary alcohol by `S_(N)^(2)`
D. Tertiary alcohol by `S_(N)^(2)`

Answer

B

Explanation

The reaction of alcohol with Lucas reagent is mostly `S_(N)1` reaction and the rate of reaction proporional to the stability of carocation formed in the reaction.
Since `3^(@)R-OH` froms `3^(@)` carbocation (most stable) hance it will react faster by `S_(N)1` reaction.