`C_(6)H_(5)Cl` is `"less" // "more"` reactive than `C_(6)H_(11)Cl`.

Explanation

To determine whether C₆H₅Cl (chlorobenzene) is less or more reactive than C₆H₁₁Cl (alkyl chloride), we can analyze the structure and bonding of both compounds.

### Step-by-Step Solution:

1. **Identify the Structures**:
- C₆H₅Cl is chlorobenzene, which has a chlorine atom attached to a benzene ring (C₆H₅).
- C₆H₁₁Cl is an alkyl chloride, specifically, it can be considered as a chlorinated cyclohexane (C₆H₁₁).

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