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Topic: Alcohols: identification of 1/2/3 alcohols, dehydration mechanism· Organic Compounds Containing Oxygen

Given below are two statements :Statement I :In Lucas test, primary, secondary and tertiary alcohols are distinguished on the basis of their reactivity with conc. HCl + ZnCl_2, known as Lucas Reagent.Statement II :Primary alcohols are most reactive a…

Given below are two statements :

Statement I :

In Lucas test, primary, secondary and tertiary alcohols are distinguished on the basis of their reactivity with conc. HCl + \(ZnCl_2\), known as Lucas Reagent.

Statement II :

Primary alcohols are most reactive and immediately produce turbidity at room temperature on reaction with Lucas Reagent.

In the light of the above statements, choose the most appropriate answer from the options given below :

1. Statement I is incorrect but Statement II is correct.

2. Both Statement I and Statement II are correct.

3. Both Statement I and Statement II are incorrect.

4. Statement I is correct but Statement II is incorrect.

1 answer

Best answer

Answer: 4. Statement I is correct but Statement II is incorrect.

Key idea: Lucas reagent (conc. HCl + \(\mathrm{ZnCl_2}\)) works via carbocation formation, so reactivity is 3 degree > 2 degree > 1 degree.

Statement I is correct. Statement II is incorrect: tertiary alcohols give turbidity immediately, secondary in about 5 minutes, primary only on heating or not at room temperature. Option 4.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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