A) \[o-\]nitro benzoic acid
B) \[m-\]nitro benzoic acid
C) \[m-\]chloro benzoic acid
D) \[m-\]cyano benzoic acid
Correct Answer: A
Solution :
Key Idea: (i) Electron withdrawing groups increase the acidity. (ii) The effect of withdrawing groups is maximum at ortho position due to nearness. \[\therefore \]Among given choices o-nitro benzoic acid is most acidic.
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