JEE Main Chemistry question

Which one is correct for the acidic nature of the following? (i) PhCOOH (ii) o-NO₂C₆H₄COOH (iii) p-NO₂C₆H₄COOH (iv) m-NO₂C₆H₄COOH

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

Answer: (A)

Solution

The strongly electron-withdrawing –NO₂ group increases acidity at all three ring positions relative to unsubstituted benzoic acid; the ortho isomer is strongest (close-range inductive/field "ortho effect"), followed by

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Question ID VK-150082