Select the most stable carbocation from amongst the following

Options

A.
B.
C.
D.

Explanation

To determine the most stable carbocation from the given options, we need to analyze the degree of each carbocation. Here’s a step-by-step solution:

### Step 1: Understand Carbocation Stability
Carbocations are classified based on the number of carbon atoms attached to the positively charged carbon atom:
- **Tertiary (3°) Carbocation**: The positively charged carbon is attached to three other carbon atoms. This is the most stable type of carbocation due to hyperconjugation and inductive effects.
- **Secondary (2°) Carbocation**: The positively charged carbon is attached to two other carbon atoms. This is less stable than a tertiary carbocation.
- **Primary (1°) Carbocation**: The positively charged carbon is attached to only one other carbon atom. This is the least stable type of carbocation.
- **Methyl Carbocation**: A carbocation with no carbon atoms attached (only hydrogen). This is extremely unstable.

### Step 2: Analyze the Given Carbocations
Now, let's analyze the given carbocations based on the description provided:
1. **Option A**: This is a secondary carbocation (2°) because it is connected to two other carbon atoms.
2. **Option B**: This is a tertiary carbocation (3°) because it is connected to three other carbon atoms.
3. **Option C**: This is a primary carbocation (1°) because it is connected to only one other carbon atom.
4. **Option D**: This is also a secondary carbocation (2°).

### Step 3: Compare the Stability
From the analysis:
- **Option A**: Secondary (2°)
- **Option B**: Tertiary (3°)
- **Option C**: Primary (1°)
- **Option D**: Secondary (2°)

Since tertiary carbocations are the most stable, **Option B** is the most stable carbocation among the given choices.

### Conclusion
The most stable carbocation is **Option B**.

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