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Arrange the following carboxylic acids with increasing order of their acidic strength and justify your answer. 1) 2) 3)

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Question

Arrange the following carboxylic acids with increasing order of their acidic strength and justify your answer.

1) 

2)

3)

Short/Brief Note
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Solution

  1. Increasing order of their acidic strength: 2 > 3 > 1.
  2. Oxygen atom is electronegative and exerts electron withdrawing inductive effect (–I effect).
  3. Thus, compound (2) and (3) are more acidic as compared to (1).
  4. 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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Chapter 12: Aldehydes, Ketones and Carboxylic acids - Exercises [Page 281]

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Balbharati Chemistry [English] Standard 12 Maharashtra State Board
Chapter 12 Aldehydes, Ketones and Carboxylic acids
Exercises | Q 3.7 | Page 281

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