Question

Which of the following has maximum acidic strength ?

• A. o-Nitrobenzoic acid
• B. m-Nitrobenzoic acid
• C. p-Nitrobenzoic acid
• D. p-Nitrophenol

Answer 1

Answer: (A)

Due to electron withdrawing nature of -$N{O}_2$ group and ‘ortho effect’, $o$-nitrobenzoic acid has maximum acidic strength.