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JEE Advanced levelSingle correct optionDifficulty 3 of 3ap049

P and Q are isomers of . P gives turbidity immediately with Lucas reagent and a negative iodoform test. Q gives turbidity after about 5 minutes and a positive iodoform test. P and Q are, respectively,

  1. Abutan-1-ol and butan-2-ol
  2. B2-methylpropan-1-ol and butan-2-ol
  3. C2-methylpropan-2-ol and butan-1-ol
  4. D2-methylpropan-2-ol and butan-2-ol

Answer: D

Immediate turbidity means a tertiary alcohol, so P is 2-methylpropan-2-ol (no unit, so iodoform negative). Q is secondary and gives iodoform, so it has a unit: butan-2-ol.
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