Question:
Identify Lucas reagent from following.
Identify Lucas reagent from following.
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Lucas reagent contains concentrated HCl with a Lewis acid dissolved in it.
Updated On: Nov 12, 2026
- conc. \(\text{HCl}\) + anhydrous \(\text{AlCl}_{3}\)
- conc. \(\text{HCl}\) + anhydrous \(\text{ZnCl}_{2}\)
- conc. \(\text{HCl}\) + dil. \(\text{H}_{2}\text{SO}_{4}\)
- conc. \(\text{HCl}\) + conc. \(\text{H}_{2}\text{SO}_{4}\)
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Lucas reagent is used to distinguish primary, secondary and tertiary alcohols.
Step 2: Composition
It is a mixture of concentrated \(\text{HCl}\) and anhydrous \(\text{ZnCl}_2\).
Zinc chloride, a Lewis acid, helps remove the \(-\text{OH}\) group so the alcohol is converted to an alkyl chloride, seen as turbidity.
Step 3: Use
Tertiary alcohols turn turbid immediately, secondary ones in about 5 minutes, and primary ones do not at room temperature.
Final Answer:
Lucas reagent is conc. \(\text{HCl}\) with anhydrous \(\text{ZnCl}_2\). \[ \boxed{\text{(B) }\text{conc. HCl + anhydrous ZnCl}_{2}} \]
Lucas reagent is used to distinguish primary, secondary and tertiary alcohols.
Step 2: Composition
It is a mixture of concentrated \(\text{HCl}\) and anhydrous \(\text{ZnCl}_2\).
Zinc chloride, a Lewis acid, helps remove the \(-\text{OH}\) group so the alcohol is converted to an alkyl chloride, seen as turbidity.
Step 3: Use
Tertiary alcohols turn turbid immediately, secondary ones in about 5 minutes, and primary ones do not at room temperature.
Final Answer:
Lucas reagent is conc. \(\text{HCl}\) with anhydrous \(\text{ZnCl}_2\). \[ \boxed{\text{(B) }\text{conc. HCl + anhydrous ZnCl}_{2}} \]
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