The p-isomer of dichlorobenzene has higher melting point than o-and m-isomer. Why?

Explanation

To understand why the p-isomer (para-isomer) of dichlorobenzene has a higher melting point than the o-isomer (ortho-isomer) and m-isomer (meta-isomer), we can analyze the structural and symmetry aspects of these isomers.

### Step-by-Step Solution:

1. **Identify the Isomers**:
- The three isomers of dichlorobenzene are:
- **Ortho (o-) isomer**: Chlorine atoms are adjacent to each other on the benzene ring.
- **Meta (m-) isomer**: Chlorine atoms are separated by one carbon atom on the benzene ring.
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