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Answer: 3. [structure: 2,4,6-trinitrophenol]

Key idea: electron-withdrawing groups stabilise the phenoxide ion and increase acidity.

2,4,6-Trinitrophenol (picric acid) has three \(\mathrm{-NO_2}\) groups at o,p positions, which strongly delocalise the negative charge (-R, -I). 4-Nitrophenol is less acidic, phenol less still, and 4-methylphenol (electron-donating methyl) is the least acidic. So picric acid is most acidic.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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