NEET 2016 Phase 2 · ChemistryPrevious Year Question
The correct order of strengths of the carboxylic acids (I), (II) and (III) is:
Answer: (B) II > III > I. \textbf{Answer:} (b) II > III > I \textbf{Solution:} Acid strength here is governed by the (inductive electron-withdrawing) effect of the ring oxygen, which stabilises the carboxylate.
- A.I > II > III
- B.II > III > I✓
- C.III > II > I
- D.II > I > III
Correct Answer
(B) II > III > I
Solution & Explanation
\textbf{Answer:} (b) II > III > I \textbf{Solution:} Acid strength here is governed by the (inductive electron-withdrawing) effect of the ring oxygen, which stabilises the carboxylate. The inductive effect weakens rapidly with distance, so the acid with the ring oxygen nearer the -bearing carbon (II) is the strongest, the one with oxygen farther away (III) is intermediate, and the all-carbon cyclohexane ring (I), having no electron-withdrawing oxygen, is the weakest. Order: II > III > I. Hence (b).
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