Discussion
Intramolecular hydrogen bonding is present in
Answer: D
Intramolecular hydrogen bonding is present in o-nitrophenol.
In o-nitrophenol the –OH and –NO2 groups are on adjacent carbons, so the hydroxyl hydrogen bonds to an oxygen of the nitro group within the same molecule, forming a six-membered ring (chelation). This is why o-nitrophenol is more volatile and less water-soluble than the para isomer.
In p-nitrophenol the groups are too far apart, so it forms intermolecular hydrogen bonds. Water, methanol and phenol also hydrogen bond between molecules, not within one.
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