Question:medium
An unknown alcohol is treated with "Lucas reagent" to determine whether the alcohol is primary, secondary, or tertiary. Which alcohol reacts fastest and by what mechanism?
An unknown alcohol is treated with "Lucas reagent" to determine whether the alcohol is primary, secondary, or tertiary. Which alcohol reacts fastest and by what mechanism?
Show Hint
Lucas reagent test works on carbocation stability, making tertiary alcohols the fastest-reacting.
Updated On: Jan 13, 2026
- Secondary alcohol by SN₁
- Tertiary alcohol by SN₁
- Secondary alcohol by SN₂
- Tertiary alcohol by SN₂
Show Solution
The Correct Option is B
Solution and Explanation
Step 1: Lucas Test Principle
- The Lucas test distinguishes alcohols by their reaction with ZnCl2/HCl.
Step 2: Reactivity Sequence
- Tertiary alcohols exhibit the highest reactivity, proceeding through the SN1 mechanism.
Conclusion: Tertiary alcohol via SN1.
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