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An unknown alcohol gives immediate turbidity with Lucas reagent at room temperature. The alcohol is most likely:

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About This Question

Subject
chemistry
Chapter
organic compounds containing oxygen
Topic
alcohols
Difficulty
Easy
Year
2025
Tags
Lucas TestTertiary AlcoholCarbocation Stability

Solution

Correct Answer:

2-Methylpropan-2-ol

Lucas reagent (conc. HCl + anhydrous ZnCl2) converts alcohols to alkyl chlorides. Tertiary alcohols react instantly because they form the most stable carbocation intermediate. Hence immediate turbidity indicates a tertiary alcohol, i.e., 2-methylpropan-2-ol.

This easy difficulty chemistry question is from the chapter organic compounds containing oxygen, covering the topic of alcohols. It appeared in the 2025 exam.

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