Which of the following reactions will not generate a carbonion?

Options

A.
B.
C.
D. `CH_(3)-C-=C-H overset(NaNH_(2)//NH_(3))to`

Answer

To determine which of the given reactions will not generate a carbonion, we need to analyze each reaction step by step. A carbonion is a species where a carbon atom carries a negative charge, typically formed when a carbon atom gains an electron.

### Step-by-Step Solution:

1. **Identify the Compounds and Reactions**:
- We have four different reactions to analyze:
1. Cyclohexane-1,3-dione with sodium ethoxide.
2. A compound with a nitro group (NO2) reacting with an amide (NH2).
3. A compound reacting with antimony pentafluoride (SbF5).
4. An alkyne (CH3C≡CH) reacting with sodium amide (NaNH2).

2. **Analyze the First Reaction**:
- **Cyclohexane-1,3-dione + NaOEt**:
- The sodium ethoxide acts as a base and can deprotonate a hydrogen atom from the carbon adjacent to the carbonyl group, leading to the formation of a carbonion.
- **Conclusion**: This reaction generates a carbonion.

3. **Analyze the Second Reaction**:
- **NO2 compound + NH2**:
- The amide (NH2) acts as a base and can deprotonate a hydrogen atom from the carbon adjacent to the nitro group, leading to the formation of a carbonion.
- **Conclusion**: This reaction also generates a carbonion.

4. **Analyze the Third Reaction**:
- **Compound + SbF5**:
- The reaction with antimony pentafluoride leads to the formation of a complex. Here, the carbon does not gain a negative charge; instead, it forms a positively charged complex.
- **Conclusion**: This reaction does not generate a carbonion.

5. **Analyze the Fourth Reaction**:
- **Alkyne (CH3C≡CH) + NaNH2**:
- Sodium amide acts as a strong base and can deprotonate the terminal hydrogen of the alkyne, leading to the formation of a carbonion.
- **Conclusion**: This reaction generates a carbonion.

6. **Final Conclusion**:
- The only reaction that does not generate a carbonion is the one involving **antimony pentafluoride (SbF5)**.

### Answer:
The reaction that will not generate a carbonion is the one involving **antimony pentafluoride (SbF5)**.

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