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Lucas reagent (concentrated with anhydrous ) is added to the alcohol shown at room temperature. What is observed?

  1. ATurbidity appears immediately.
  2. BTurbidity appears after about 5 minutes.
  3. CNo turbidity at room temperature.
  4. DA gas is evolved with effervescence.

Answer: A

The alcohol is 2-methylpropan-2-ol (tert-butyl alcohol). With Lucas reagent it forms the tertiary carbocation very rapidly and then , which is insoluble and makes the solution turbid at once. A secondary alcohol takes about 5 minutes and a primary alcohol shows no turbidity at room temperature.
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