JEE Main Chemistry question

The acidity of the compounds RCOOH, H₂CO₃, C₆H₅OH, ROH decreases in the order

(A)RCOOH > H₂CO₃ > C₆H₅OH > ROHCorrect
(B)C₆H₅OH > RCOOH > H₂CO₃ > ROH
(C)ROH > C₆H₅OH > RCOOH > H₂CO₃
(D)H₂CO₃ > RCOOH > C₆H₅OH > ROH

Answer: (A)

Solution

Acid strength here follows the standard comparison: a carboxylic acid (pKₐ ≈ 4–5, resonance-stabilized carboxylate) is stronger than carbonic acid (pKₐ₁ ≈ 6.3), which is stronger than phenol (pKₐ ≈ 10, its conjugate base

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Question ID VK-149508