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Question 780002
JEE Chemistry · Easy

Alcohols, Phenols and Ethers: Lucas test MCQ

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Lucas testEasyQuestion 780002

Question

Which alcohol reacts immediately with Lucas reagent (ZnCl₂/HCl) at room temperature?
  1. A
    Tertiary alcohol (3°)
    Correct
  2. B
    Primary alcohol (1°)
  3. C
    Secondary alcohol (2°)
  4. D
    All react at same rate

Correct answer

Tertiary alcohol (3°)

Explanation

Lucas test distinguishes 1°, 2°, 3° alcohols. Tertiary alcohols react immediately (turbidity at once) — they form stable 3° carbocations. Secondary react in 5 min. Primary react only on heating.

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