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BITSAT 2024Paper 1
Exam
BITSAT
Year
2024
Paper
Paper 1
Subject
Chemistry
Chapter
Alcohols Phenols and Ethers

BITSAT 2024 · Paper 1 · Chemistry · Alcohols Phenols and Ethers

An unknown alcohol is treated with the "Lucas reagent" to determine...

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 :

Options

  1. Asecondary alcohol by SN1\mathrm{S}_{\mathrm{N}} 1
  2. Btertiary alcohol by SN1\mathrm{S}_{\mathrm{N}} 1
  3. Csecondary alcohol by SN2\mathrm{S}_{\mathrm{N}} 2
  4. Dtertiary alcohol by SN2\mathrm{S}_{\mathrm{N}} 2

Correct answer

B. tertiary alcohol by SN1\mathrm{S}_{\mathrm{N}} 1

Step-by-step solution

The reaction of alcohol with Lucas reagent is mostly an SN1\mathrm{S}_{N}1 mechanism reaction and the rate of reaction is directly proportional to the carbocation stability formed in the reaction, hence tertiary alcohol will react fastest.
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