How many isomers are possible for nitrophenol ?

Answer

To determine how many isomers are possible for nitrophenol, we need to analyze the structure of phenol and the possible positions for the nitro group (NO2) on the benzene ring.

### Step-by-Step Solution:

1. **Identify the Structure of Phenol**:
- Phenol consists of a benzene ring (C6H5) with a hydroxyl group (OH) attached to it.

2. **Identify Possible Positions for the Nitro Group**:
- The nitro group can be attached to the benzene ring at different positions relative to the hydroxyl group. The positions are:
- Ortho (adjacent to the OH group)
- Meta (one carbon away from the OH group)
- Para (opposite the OH group)

3. **Count the Isomers**:
- **Ortho Isomer**: When the nitro group is at the 2-position relative to the OH group.
- **Meta Isomer**: When the nitro group is at the 3-position relative to the OH group.
- **Para Isomer**: When the nitro group is at the 4-position relative to the OH group.

4. **Conclusion**:
- There are three distinct isomers of nitrophenol based on the position of the nitro group:
- Ortho-nitrophenol
- Meta-nitrophenol
- Para-nitrophenol

### Final Answer:
Thus, the total number of isomers possible for nitrophenol is **3**.

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