JEE Main Chemistry question

Chemistry Aldehydes, Ketones and Carboxylic Acids JEE Main

[AIEEE 2004] For the correct order of acidic strength of (I) C₆H₅COOH, (II) *o*-O₂N–C₆H₄–COOH, (III) *p*-O₂N–C₆H₄–COOH, (IV) *m*-O₂N–C₆H₄–COOH:

(A)II > III > IV > I
(B)II > IV > III > ICorrect
(C)II > IV > I > III
(D)I > II > III > IV

Answer: (B)

Solution

The electron-withdrawing –NO₂ group raises the acidity of benzoic acid in all three substitution patterns, with the inductive effect (reinforced by proximity/steric inhibition of resonance) making the *ortho*

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Question ID VK-140270