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MHT CET202617 April 2026Evening ShiftChemistryAlcohols Phenols and EthersActual

Which of the following alcohols on addition of Lucas reagent reacts fast and turns the reagent turbid instantly.

Options

  1. An - Butyl alcohol
  2. Bsec - Butyl alcohol
  3. Ciso - Butyl alcohol
  4. Dtert - Butyl alcohol

Correct answer

D. tert - Butyl alcohol

Step-by-step solution

Lucas reagent is a mixture of concentrated HCl and anhydrous ZnCl ₂ . The reaction of alcohols with Lucas reagent proceeds via an S_N1 mechanism, which involves the formation of a carbocation intermediate. The rate of reaction depends on the stability of the carbocation formed. The order of stability of carbocations is tertiary > secondary > primary. Therefore, the reactivity of alcohols towards Lucas reagent follows the order: tertiary > secondary > primary. Tertiary alcohols react instantly to form an insoluble a

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