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The boiling point of p-nitrophenol is higher than that of o-nitrophenol because

1. NO2 group at p-position behave in a different way from that at o-position
2. Intramolecular hydrogen bonding exists in p-nitrophenol
3. There is intermolecular hydrogen bonding in p-nitrophenol
4. p-nitrophenol has a higher molecular weight than o-nitrophenol

Correct answer: There is intermolecular hydrogen bonding in p-nitrophenol

Solution

The higher boiling point of p-nitrophenol is due to the presence of intermolecular hydrogen bonding, which requires more energy to break compared to the intramolecular hydrogen bonding in o-nitrophenol.

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