An unknown alcohol is treated with the “Lucas reagent” to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism :

Question

$\begin{array}{1 1} (1)\text{secondary alcohol by} S_N 1 \\ (2) \text{tertiary alcohol by}S_N 1 \\ (3) \text{secondary alcohol by } S_N 2 \\(4) \text{ tertiary alcohol by} S_N2\end {array}$