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Answer: 2. [structure: 2-nitrophenol (NO2 and OH on adjacent carbons), see figure]

Key idea: intramolecular H-bonding needs the H-donor (-OH) and acceptor (\(\mathrm{-NO_2}\)) close to each other in the same molecule.

In o-nitrophenol, the adjacent \(\mathrm{OH}\) and \(\mathrm{NO_2}\) groups form a chelate ring. In the meta and para isomers the groups are too far apart, so they form intermolecular bonds. HF shows only intermolecular H-bonds. Option 2.

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