A) p-nitrophenol
B) p-nitrobenzoic acid
C) o-nitrobenzoic acid
D) m-nitrobenzoic acid
Correct Answer: C
Solution :
o-nitrobenzoic acid is the strongest acid among these. \[--N{{O}_{2}}\] group is a powerful electron withdrawing group and it has most effect when present at o-position. It is also known as o-effect. Due to its electron withdrawing nature electron density on H-atom in ?COOH group becomes very less, hence it can be easily donated.
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