Question:
Which of the following solution is called as Lucas reagent?
Which of the following solution is called as Lucas reagent?
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Lucas reagent (HCl + ZnCl$_2$) is commonly used to test the reactivity of alcohols and to classify them into primary, secondary, and tertiary categories.
Updated On: Feb 18, 2026
- Concentrated carbolic acid with zinc chloride.
- Concentrated hydrochloric acid with zinc chloride.
- Concentrated sulphuric acid with zinc sulphate.
- Concentrated nitric acid with zinc nitrate.
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The Correct Option is B
Solution and Explanation
Step 1: Understanding Lucas reagent.
Lucas reagent is a solution of concentrated hydrochloric acid (HCl) and zinc chloride (ZnCl$_2$). It is used to classify alcohols based on their reactivity.
Step 2: Analyzing the options.
(A) Concentrated carbolic acid with zinc chloride: This is not Lucas reagent.
(B) Concentrated hydrochloric acid with zinc chloride: This is the correct Lucas reagent, used for testing alcohols.
(C) Concentrated sulphuric acid with zinc sulphate: This is not Lucas reagent.
(D) Concentrated nitric acid with zinc nitrate: This is not Lucas reagent either.
Step 3: Conclusion.
The correct answer is (B) Concentrated hydrochloric acid with zinc chloride.
Lucas reagent is a solution of concentrated hydrochloric acid (HCl) and zinc chloride (ZnCl$_2$). It is used to classify alcohols based on their reactivity.
Step 2: Analyzing the options.
(A) Concentrated carbolic acid with zinc chloride: This is not Lucas reagent.
(B) Concentrated hydrochloric acid with zinc chloride: This is the correct Lucas reagent, used for testing alcohols.
(C) Concentrated sulphuric acid with zinc sulphate: This is not Lucas reagent.
(D) Concentrated nitric acid with zinc nitrate: This is not Lucas reagent either.
Step 3: Conclusion.
The correct answer is (B) Concentrated hydrochloric acid with zinc chloride.
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