Question

The most acidic compound among the following is___________ .

• A. phenol
• B. ethanol
• C. $3,5$-dinitrophenol
• D. $4,4$-methoxyphenol

Answer 1

The correct option is C $3,5$-dinitrophenol

Nitro $(-N{O}_2)$ group is a strong electron withdrawing group. Therefore, it will stabilize the anion formed after losing a proton from an acid through resonance more than any other group.

Hence, the most acidic compound is $3,5$-dinitrophenol.