JEE Main Chemistry question

Consider the acidity of the carboxylic acids (i), (ii), (iii), (iv) — a set of substituted acetic/aromatic acids with varying numbers/positions of electron-withdrawing substituents. Which of the following orders is correct?

(A)(i) > (ii) > (iii) > (iv)
(B)(ii) > (iv) > (iii) > (i)
(C)(ii) > (iv) > (i) > (iii)Correct
(D)(ii) > (iii) > (i) > (iv)

Answer: (C)

Solution

As with the related question on substituted benzoic acids in this set, acidity is governed by the number and proximity of electron-withdrawing groups: the most heavily/favourably substituted acid (ii) is most acidic, and the least activated (or most alkyl-substituted, electron-donating) acid is least acidic; the

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Question ID VK-149277