Answer:
See explanation
Step-by-step explanation:
The nature of hydrogen bonding in 2- nitrophenol and 4- nitrophenol is quite different.
In 2- nitrophenol, there is intramolecular hydrogen bonding. As a result of this, the compound has a low boiling point.
Then in 4- nitrophenol, there is intermolecular hydrogen bonding. This accounts for molecular association and higher boiling point in 4- nitrophenol.