While separating a mixture of ortho- and para-nitrophenols steam distillation, name the isomer which will be steam volatile. Give reason.

Explanation

To solve the question regarding the steam volatility of ortho- and para-nitrophenols, we need to analyze the molecular structures and the types of hydrogen bonding present in each isomer.

### Step-by-Step Solution:

1. **Identify the Structures of the Isomers**:
- Ortho-nitrophenol (o-nitrophenol) has the nitro group (-NO2) and hydroxyl group (-OH) on adjacent carbon atoms of the benzene ring.
- Para-nitrophenol (p-nitrophenol) has the nitro group and hydroxyl group on opposite sides of the benzene ring.

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