JEE Main 2013ChemistryAlcohols Phenols and EthersEasyMCQ

JEE Main 2013 — Alcohols Phenols and Ethers Question with Solution

JEE Main 2013 (07 Apr)

Question

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:

Choose an option

Show full solutionCorrect option: D
Correct answer
DTertiary alcohol by SN1

Step-by-step explanation

3° alcohol reacts fastest giving white turbidity immediately on adding Lucas reagent.
Reaction takes place through carbocation formation involving SN1 mechanism. Rate of reaction in this reaction is directly proportional to the stability of the carbocation formed.
3° R-OH(tertiary alcohol) forms 3° carbocation and therefore, the reaction is fastest.

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About this question

This is a previous-year question from JEE Main 2013, covering the Alcohols Phenols and Ethers chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.