p-Dichlorobenzene has higher m.p. and solubility than those of -and m-isomers. Discuss.

Explanation

To understand why p-dichlorobenzene has a higher melting point (m.p.) and solubility compared to its ortho (o-) and meta (m-) isomers, we can analyze the structural and intermolecular forces at play. Here’s a step-by-step breakdown of the reasoning:

### Step 1: Structure of Isomers
- **Draw the structures** of the three isomers of dichlorobenzene:
- **Ortho-dichlorobenzene (o-dichlorobenzene)**: Chlorine atoms are adjacent to each other on the benzene ring.
- **Meta-dichlorobenzene (m-dichlorobenzene)**: Chlorine atoms are separated by one carbon atom on the benzene ring.
- **Para-dichlorobenzene (p-dichlorobenzene)**: Chlorine atoms are opposite each other on the benzene ring.

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