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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3si140

Consider the four constitutional isomeric alcohols of formula (stereoisomers are ignored). Select the correct statement(s).

  1. AExactly two of them give a yellow precipitate with .
  2. BExactly two of them give an aldehyde on oxidation with PCC.
  3. CExactly one of them gives turbidity immediately with Lucas reagent (/conc. ) at room temperature.
  4. DExactly one of them gives a yellow precipitate with .

Answer: B, C, D

The alcohols are butan-1-ol, butan-2-ol, 2-methylpropan-1-ol and 2-methylpropan-2-ol. Only the tertiary alcohol reacts immediately with Lucas reagent. The two primary alcohols are oxidised to aldehydes by PCC. Only butan-2-ol has and gives iodoform, so 'exactly two' is wrong.
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