Identify the alcohol that react immediately with Lucas reagent?

Identify the alcohol that react immediately with Lucas reagent?
  1. Ethanol
  2. Butan-2-ol
  3. 2-Methyl Propan-2-ol
  4. Propan-2-ol

Solution

Tertiary carbocation is far more stable than secondary carbocation, and primary carbocation is least stable due to hyper formation. Hence, tertiary alcohol reacts fastest with Lucas reagent at room temperature, $2-$methyl propan$-2-$ol is a tertiary alcohol, thus reacts immediately with Lucas reagent.

Asked in: MHT CET 2020 (20 Oct Shift 2)

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