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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 S N 2
  2. BTertiary alcohol by S N 2
  3. CSecondary alcohol by S N 1
  4. DTertiary alcohol by S N 1

Correct answer

D. Tertiary alcohol by S N 1

Step-by-step solution

3° alcohol reacts fastest giving white turbidity immediately on adding Lucas reagent. Reaction takes place through carbocation formation involving S N 1 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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