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 aromatic ring.

### Step-by-Step Solution:

1. **Identify the Compounds**:
- The first compound is **o-chloronitrobenzene** (C6H4ClNO2).
- The second compound is **2,4,6-trinitrochlorobenzene** (C6HClN3O6).

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