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Out of o-nitrophenol and p-nitrophenol, ...

Out of o-nitrophenol and p-nitrophenol, which is more volatile? Explain.

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o-nitrophenol `(b.p=100^(@)C)` is more volatile than p-nitrophenol `(b.p.=279^(@)C)` . In o-nitrophenol, there is intramolecular hydrogen bonding while intermolecular hydrogen bonding is present in p-nitrophenol molecules. Due to the presence of greater forces of intraction, the boiling point of p-nitrophenol is more, For details, consult section 15
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