Which of the following is not an example of Sandmeryer's reaction?

Options

A. `C_(6) H_(5) overset(+)(N_(2)) Cl^(-) overset(CuCl)(rarr) C_(6)H_(5)Cl`
B. `C_(6) H_(5) overset(+)(N_(2)) Cl^(-) overset(CuBr)(rarr) C_(6)H_(5)Br`
C. `C_(6) H_(5) overset(+)(N_(2)) Cl^(-) overset(CuCN)(rarr) C_(6)H_(5)CN`
D. `C_(6) H_(5) overset(+)(N_(2)) Cl^(-) underset(Kl)overset(KCN)(rarr) C_(6)H_(5)I`

Explanation

To determine which of the following is not an example of Sandmeyer's reaction, we first need to understand what Sandmeyer's reaction entails.

### Step-by-Step Solution:

1. **Understanding Sandmeyer's Reaction**:
- Sandmeyer's reaction involves the conversion of benzene diazonium salts into aryl halides or aryl cyanides using copper salts. The general reaction can be summarized as:
\[ \text{Ar-N}_2^+ \text{X}^- + \text{CuX} \rightarrow \text{Ar-X} + \text{N}_2 + \text{HX} \]
- Here, Ar represents an aryl group, X is a halogen (like Cl, Br), and CuX is a copper salt (like CuCl, CuBr, CuCN).

2. **Identifying the Options**:
- We need to analyze each option provided in the question to see if they involve the use of copper salts and result in the formation of aryl halides or cyanides.

3. **Analyzing Each Reaction**:
- **Option A**: Reaction with CuCl to form chlorobenzene.
- This is a Sandmeyer's reaction.
- **Option B**: Reaction with CuBr to form bromobenzene.
- This is also a Sandmeyer's reaction.
- **Option C**: Reaction with CuCN to form cyanobenzene.
- This is again a Sandmeyer's reaction.
- **Option D**: Reaction with KI and KCN to form iodobenzene.
- This does not involve copper salts and therefore is not a Sandmeyer's reaction.

4. **Conclusion**:
- Based on the analysis, the option that does not represent a Sandmeyer's reaction is **Option D**, as it does not utilize copper salts.

### Final Answer:
**Option D** is not an example of Sandmeyer's reaction.

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