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JEE Main levelSingle correct optionDifficulty 2 of 3ap239

The alcohol shown becomes turbid with Lucas reagent at room temperature after about 5 minutes. Which isomer of molecular formula among the structures shown gives turbidity immediately?

  1. AStructure A
  2. BStructure B
  3. CStructure C
  4. DStructure D

Answer: C

The alcohol shown is butan-2-ol, a secondary alcohol, which is turbid after about 5 minutes. The tertiary isomer 2-methylpropan-2-ol gives the tertiary cation and turbidity at once. Butan-1-ol and 2-methylpropan-1-ol are primary and show no turbidity, and diethyl ether is not an alcohol.
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