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 substitution reactions, we need to analyze the nature of the halide and the structure of the compound.

### Step-by-Step Solution:

1. **Understanding Substitution Reactions**:
- Substitution reactions involve the replacement of a leaving group (like a halide) by a nucleophile. For this to occur, the bond between the carbon and the leaving group must be able to break easily.

2. **Identifying the Halides**:
- We need to consider different types of organic halides. Common examples include alkyl halides (like alkyl chlorides, bromides, iodides) and aryl halides (like chlorobenzene).

3. **Analyzing Aryl Halides**:
- Aryl halides, particularly chlorobenzene, have a carbon-halogen bond that exhibits partial double bond character due to resonance. This means that the bond is stronger and more stable, making it less likely to undergo substitution reactions.

4. **Resonance Effect**:
- In chlorobenzene, the chlorine atom can participate in resonance with the aromatic ring. This resonance stabilizes the structure and increases the bond strength between the carbon and chlorine, making it difficult for the nucleophile to attack and for the chlorine to leave.

5. **Comparing with Alkyl Halides**:
- In contrast, alkyl halides do not have this resonance stabilization. Their carbon-halogen bonds are typically single bonds, which can break more easily, allowing for substitution reactions to occur.

6. **Conclusion**:
- Based on the analysis, chlorobenzene (an aryl halide) does not undergo substitution reactions due to the partial double bond character of the C-Cl bond, which makes it harder for the bond to break compared to other alkyl halides.

### Final Answer:
The organic halide that does not undergo any substitution reaction is **chlorobenzene**.