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Chemistry · PYQ NEET UG 2022

हिन्दी

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. \( \text{HCl} + \text{ZnCl}_2 \) 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 correct but Statement II is incorrect.
  2. Statement I is incorrect but Statement II is correct.
  3. Both Statement I and Statement II are correct.
  4. Both Statement I and Statement II are incorrect.

Correct answer · Option 1

Statement I is correct but Statement II is incorrect.

Explanation

Tertiary alcohols react fastest with Lucas reagent producing immediate turbidity, whereas primary alcohols do not react at room temperature. Thus, Statement I is correct and Statement II is incorrect.
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