The organic halide that does not under go any substitution reaction is

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Answer

To determine which organic halide does not undergo any substitution reaction, we need to analyze the structures provided and understand the concept of substitution reactions.

### Step-by-Step Solution:

1. **Understanding Substitution Reactions**:
- Substitution reactions involve the replacement of one atom or group in a molecule with another atom or group. Common types include nucleophilic substitution (Sn1 and Sn2) and electrophilic aromatic substitution (SnAr).

2. **Identifying the Structures**:
- We have several organic halides to consider:
- A primary alkyl halide (e.g., CH2-CH(CH2Cl)).
- An alkene with a chlorine atom (e.g., CH2=CH-CH2Cl).
- An aromatic compound with a chlorine atom (e.g., benzene with Cl).
- A cycloalkane with a chlorine atom (e.g., cyclohexane with Cl).

3. **Analyzing Each Structure**:
- **Primary Alkyl Halide**: This can undergo substitution reactions because it does not have significant resonance stabilization.
- **Alkene with Cl**: The presence of a double bond can lead to resonance, but it can still undergo substitution reactions.
- **Aromatic Compound**: The chlorine on an aromatic ring is part of a resonance-stabilized system. This makes it less likely to undergo substitution reactions due to the stability provided by resonance.
- **Cycloalkane with Cl**: This structure does not have resonance stabilization, so it can undergo substitution reactions.

4. **Conclusion**:
- The organic halide that does not undergo any substitution reaction is the **aromatic compound** (benzene with Cl). The resonance stabilization in the aromatic system makes it resistant to substitution.

### Final Answer:
The organic halide that does not undergo any substitution reaction is the aromatic compound (benzene with Cl).