Out of o-nitrophenod and p-nitrophenol, which has higher boiling point and why ?

Explanation

To determine which compound, ortho-nitrophenol or para-nitrophenol, has a higher boiling point, we need to analyze their structures and the types of hydrogen bonding they can undergo.

### Step 1: Analyze the Structures
- **Ortho-nitrophenol** has the hydroxyl group (-OH) and the nitro group (-NO2) positioned on adjacent carbon atoms of the benzene ring.
- **Para-nitrophenol** has the hydroxyl group and the nitro group positioned on opposite sides of the benzene ring.

### Step 2: Identify Hydrogen Bonding
- In **ortho-nitrophenol**, the proximity of the -OH group and the nitro group allows for **intramolecular hydrogen bonding**. This means that the hydrogen from the -OH can form a bond with the oxygen of the nitro group within the same molecule.
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