Question

Which of the following alcohols on addition of Lucas reagent reacts fast and turns the reagent turbid instantly.

• A. n - Butyl alcohol
• B. sec - Butyl alcohol
• C. iso - Butyl alcohol
• D. tert - Butyl alcohol

Hint:

Tertiary alcohols give the most stable carbocation, so the turbidity appears at once.

Answer 1

The Correct Option is D

Step 1: Mechanism idea:
$\text{SN1}$ path: protonated alcohol loses water to form a carbocation, which then picks up chloride.

Step 2: Decide:
The tertiary butyl cation is the most stable, so its alcohol reacts at once (D).

Final Answer:
tert-Butyl alcohol. \[ \boxed{\text{(D)}} \]