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JEE Main · 2024 · 31 Jan 2024 · Shift 1 · Alcohols Phenols and Ethers

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Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: value of phenol is 10.0 while that of ethanol is 15.9 .
Reason R: Ethanol is stronger acid than phenol.
In the light of the above statements, choose the correct answer from the options given below:
  1. (A)A is true but R is false.✓ Correct
  2. (B)A is false but R is true.
  3. (C)Both A and R are true and R is the correct explanation of A .
  4. (D)Both A and R are true but R is NOT the correct explanation of A .

Answer: (A)

Solution

Phenol has and ethanol has . A lower means a stronger acid, so phenol is the stronger acid (its conjugate base, phenoxide, is stabilised by resonance delocalisation into the ring), not ethanol.

So Assertion A (the stated values) is true, but Reason R (claiming ethanol is the stronger acid) is false.

JEE Main · 2024 · 31 Jan 2024 · Shift 1 · Single correct option

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