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The alcohol that produces turbidity immediately with ZnCl ₂ / conc. HCl at room temperature

Options

  1. A1-hydroxy butane
  2. B2-hydroxy butane
  3. C2-hydroxy-2-methyl propane
  4. D1-hydroxy-2-methyl propane

Correct answer

C. 2-hydroxy-2-methyl propane

Step-by-step solution

Mixture of anhydrous ZnCl ₂ and conc. HCl is known as Lucas reagent. Lucas test is used for the distinction between primary, secondary and tertiary alcohols. The tertiary alcohol reacts immediately with Lucas reagent producing turbidity. The secondary alcohol gives turbidity within 5-10 min and primary alcohol do not give turbidity at all at room temperature. In the given alternates, 2 -hydroxy-2-methyl propane is 3^ alcohol, so it is more reactive.

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