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Alcohols, Phenols and Ethers
Lucas Test for Classification of Alcohols
1 question from 1 paper, each with its answer.
- question
- 1
- paper
- 1
- years asked, 2017–2026
- 1 of 10
- of Alcohols, Phenols and Ethers
- 1.54%
Concepts tested
- Reactivity order of 1°, 2°, 3° alcohols with Lucas reagent
All Questions
2024 1 question
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Which one of the following alcohols reacts instantaneously with Lucas reagent?Alcohols react with Lucas reagent (conc. HCl + anhyd. $ZnCl_2$) via a carbocation intermediate, forming an alkyl chloride (turbidity). A tertiary carbocation is more stable than secondary or primary, so tertiary alcohols react instantaneously. 2-methylpropan-2-ol (tert-butyl alcohol), $(CH_3)_3C-OH$, is tertiary, so it reacts instantaneously.