Which out of o-chloronitrobenzene and 2, 4, 6-trinitrochlorobenzene is more reactive towards nucleophilic substitution?

Explanation

To determine which compound, o-chloronitrobenzene or 2,4,6-trinitrochlorobenzene, is more reactive towards nucleophilic substitution, we need to analyze the effects of the substituents on the electrophilicity of the carbon atom bonded to the chlorine atom.

### Step-by-Step Solution:

1. **Identify the Structures**:
- **o-Chloronitrobenzene** has one nitro group (–NO2) and one chlorine atom (–Cl) attached to the benzene ring.
- **2,4,6-Trinitrochlorobenzene** has three nitro groups attached to the benzene ring along with the chlorine atom.

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