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MHT CET Medical202624 April 2026Evening ShiftChemistryAlcohols Phenols and EthersActual

Which is the Lucas reagent among following?

Options

  1. AAnhydrous ZnCl ₂ dissolved in conc. HNO ₃
  2. BZnCl _ 2(aq) dissolved in conc. HCl
  3. CAnhydrous ZnCl ₂ dissolved in conc. HCl
  4. DAnhydrous ZnCl ₂ dissolved in dil. HCl

Correct answer

C. Anhydrous ZnCl ₂ dissolved in conc. HCl

Step-by-step solution

Lucas reagent is a mixture of concentrated hydrochloric acid (conc. HCl) and anhydrous zinc chloride (anhydrous ZnCl ₂ ). It is used in organic chemistry to differentiate between primary, secondary, and tertiary alcohols based on their reactivity, which is observed by the time taken for the appearance of turbidity (cloudiness) in the solution. Therefore, anhydrous ZnCl ₂ dissolved in conc. HCl is the correct composition of the Lucas reagent. Answer: Anhydrous ZnCl ₂ dissolved in conc. HCl

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