The compound which contains all the four `1^@`,`2^@`, `3^@` and `4^@` carbon atoms is

Options

A. 2, 3-dimethylpentane
B. 2,3,3-trimethylpentane
C. 2,3,4-trimethylpentane
D. 3,3-dimethylpentane

Explanation

To determine the compound that contains all four types of carbon atoms (1°, 2°, 3°, and 4°), we will analyze the given options systematically.

### Step-by-Step Solution:

1. **Understand the Degrees of Carbon:**
- A **1° (primary)** carbon is attached to only one other carbon.
- A **2° (secondary)** carbon is attached to two other carbons.
- A **3° (tertiary)** carbon is attached to three other carbons.
- A **4° (quaternary)** carbon is attached to four other carbons.

2. **Analyze Each Option:**
- **Option A: 2,3-Dimethylpentane**
- Structure:
- 5 carbons in a chain with two methyl groups on the 2nd and 3rd carbons.
- The carbons can be numbered as follows:
- C1 (1°), C2 (2°), C3 (2°), C4 (3°), C5 (1°).
- This option does not contain a 4° carbon.

- **Option B: 2,3,3-Trimethylpentane**
- Structure:
- 5 carbons in a chain with three methyl groups on the 2nd and 3rd carbons.
- The carbons can be numbered as follows:
- C1 (1°), C2 (2°), C3 (3°), C4 (3°), C5 (1°).
- This option has a 1°, 2°, and 3° carbon but no 4° carbon.

- **Option C: 2,2,3-Trimethylpentane**
- Structure:
- 5 carbons in a chain with three methyl groups on the 2nd and 3rd carbons.
- The carbons can be numbered as follows:
- C1 (1°), C2 (3°), C3 (2°), C4 (1°), C5 (1°).
- This option has a 1°, 2°, and 3° carbon but no 4° carbon.

- **Option D: 3,3-Dimethylpentane**
- Structure:
- 5 carbons in a chain with two methyl groups on the 3rd carbon.
- The carbons can be numbered as follows:
- C1 (1°), C2 (2°), C3 (3°), C4 (2°), C5 (1°).
- This option does not contain a 4° carbon.

3. **Conclusion:**
- After analyzing all options, **none of the options contain all four types of carbon atoms (1°, 2°, 3°, and 4°)**. However, if we were to consider a compound that could theoretically contain all four types, we would look for a structure that has a quaternary carbon connected to a tertiary, secondary, and primary carbon.

### Final Answer:
None of the provided options contain all four types of carbon atoms (1°, 2°, 3°, and 4°).