The order of acidic strength of following acids is

• A

  (iii) \(>\) (ii) \(>\) (i)
• B

  (ii) \(>\) (iii) \(>\) (i)
• C

  (iii) \(>\) (i) \(>\) (ii)
• Correct answer
  D

  (ii) \(>\) (i) \(>\) (iii)

Solution

Aromatic carboxylic acids are stronger to aliphatic carboxylic acids. Acidic strength order: (iii) \( > \) (ii) \( > \) (i) [Option-(a)] * If (i) is 4-ethylbenzoic acid, answer will be option-(c), but it is not given in (i).

Hence, the correct answer is option: 'D'.