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Most Important Selected Qs for JEE AdvancedChemistryAlcohols Phenols and Ethers

Which of the following pairs can be distinguished by using Lucas Test?

Options

  1. APhCH ₂ OH , CH ₃ CH ₂ OH
  2. BPhCH ₂ OH , PhOH
  3. C( CH ₃ )₂ CHOH , CH ₃ CH ₂ CH ₂ OH
  4. DCH ₃ CH ₂ CH ₂ OH , CH ₃ CH ₂ OH

Correct answer

C. ( CH ₃ )₂ CHOH , CH ₃ CH ₂ CH ₂ OH

Step-by-step solution

(A) aligned & Ph - CH ₂- OH [ conc. HCl ] anh. nCl Cl ₂ Ph - CH ₂- Cl + Zn ( OH ) Cl (immediate) & (white turbidity) & CH ₃- CH ₂- OH Lucas reagent CH ₃- CH ₂- Cl + Zn ( OH ) Cl aligned (B) Ph - CH ₂- OH [ reagent ] Lucas PhCH ₂ Cl + Zn ( OH ) Cl (immediate) (White turbidity) Ph - OH [ reagent ] Lucas No reaction under normal condition (C) aligned & ( CH ₃ )₂ CH - OH [ reagent ] Lucas ( CH ₃ )₂ CH - Cl + Zn ( OH ) Cl & (White turbidity) & (Moderate rate) & CH ₃- CH ₂- CH ₂- CH ₂- OH [ reagent ] Lucas CH ₃- CH ₂- CH

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