Why is the boiling point of 2 nitrophenol different from that of 4 nitrophenol

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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.

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