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Types of Hydrogen Bonding

O-nitrophenol...

Question

O-nitrophenol has lower boiling point than P-nitrophenol, why?

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Solution

O-nitrophenol has intramolecular hydrogen bonding. P-nitrophenol has intermolecular hydrogen bonding. Intermolecular hydrogen bonding leads to a molecular association. This increases boiling point. Hene, O-nitrophenol has a lower boiling point than P-nitrophenol.

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