Q.
Which of the following has the maximum acidic strength?
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JIPMERJIPMER 2004Organic Chemistry – Some Basic Principles and Techniques
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Solution:
o-nitrobenzoic acid is the strongest acid among these. −NO2 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.