Which of the following will react fastest with `Ag^(+)`

Options

A.
B.
C.
D.

Answer

To determine which compound will react fastest with Ag^+, we need to analyze the substituents on the aromatic ring and their effects on the reactivity of the compound. The reaction involves the abstraction of Cl^- by Ag^+, leading to the formation of a carbocation intermediate.

### Step-by-Step Solution:

1. **Identify the Compounds**: List the compounds provided in the question. For example, let’s assume we have compounds with different substituents like -Cl, -NO2, -OH, and -CH3.

2. **Understand the Role of Ag^+**: Ag^+ acts as a Lewis acid and will abstract Cl^- from the compound. The stability of the resulting carbocation after the abstraction will determine the rate of reaction.

3. **Analyze Substituents**:
- **Electron-Withdrawing Groups (EWGs)**: Groups like -NO2 and -Cl withdraw electron density from the aromatic ring, making the carbocation less stable.
- **Electron-Donating Groups (EDGs)**: Groups like -CH3 and -OH donate electron density, stabilizing the carbocation formed after Cl^- abstraction.

4. **Consider the Position of Substituents**: The position of the substituents (ortho, meta, para) affects their influence:
- At the **meta position**, resonance effects are not effective for EDGs and EWGs. Thus, the -NO2 group will have a stronger electron-withdrawing effect, while -OH and -CH3 will have a lesser effect.
- At the **ortho and para positions**, EDGs can stabilize the carbocation through resonance.

5. **Determine Reactivity**: Based on the analysis:
- The compound with -CH3 or -OH at the ortho or para position will react faster due to the stabilization of the carbocation.
- The compound with -NO2 or -Cl will react slower due to the destabilization of the carbocation.

6. **Conclusion**: Identify the compound that has the strongest EDG at the ortho or para position, as it will react the fastest with Ag^+.

### Final Answer:
The compound with the strongest electron-donating group (like -CH3 or -OH at ortho or para position) will react fastest with Ag^+.