The correct order of strengths of the carboxylic acids I, II and III is:

43 2016 Phase II Aldehydes, Ketones and Carboxylic AcidsAcidity of carboxylic acids – inductive effect Medium
The correct order of strengths of the carboxylic acids I, II and III is:
A III > II > I
B II > I > III
C I > II > III
D II > III > I

Explanation

Closer electronegative O → stronger acid.

Detailed Solution


In II the ring oxygen is closer to –COOH, exerting more –I effect; in III it is farther (less –I); in I the ring has +I effect.
Acidic strength: II > III > I

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