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Question
Arrange the following carboxylic acids with increasing order of their acidic strength and justify your answer.
1) 
2) 
3) 
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Solution
- Increasing order of their acidic strength: 2 > 3 > 1.
- Oxygen atom is electronegative and exerts electron withdrawing inductive effect (–I effect).
- Thus, compound (2) and (3) are more acidic as compared to (1).
- However, the inductive effect decreases as the oxygen in the ring moves away from the carboxyl group. Therefore, compound (3) is less acidic than compound (2).
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