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NTA Abhyas JEE Main2020ChemistryAlcohols Phenols and EthersPractice

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 mechansim?

Options

  1. ATertiary alcohol by S N 2
  2. BTertiary alcohol by S N 1
  3. CSecondary alcohol by S N 2
  4. DSecondary alcohol by S N 1

Correct answer

B. Tertiary alcohol by S N 1

Step-by-step solution

The reaction of alcohol with Lucas reagent is mostly an 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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