The number of possible monochloro derivatives of `2,2,3,3`-Tetramethylbutane is -

Options

A. `2`
B. `3`
C. `4`
D. `1`

Answer

To determine the number of possible monochloro derivatives of 2,2,3,3-tetramethylbutane, we can follow these steps:

### Step 1: Understand the Structure
2,2,3,3-tetramethylbutane is a branched alkane with the following structure:
- It has a total of 4 carbon atoms (butane).
- The second and third carbon atoms each have two methyl groups (CH₃) attached.

### Step 2: Draw the Structure
The structure can be drawn as follows:
```
CH3
|
CH3-C-CH-C-CH3
| |
CH3 CH3
```
This shows that the central carbon atoms (C2 and C3) are each attached to two methyl groups.

### Step 3: Identify the Types of Hydrogen Atoms
Next, we need to identify the types of hydrogen atoms present in the molecule:
- The hydrogen atoms attached to the carbon atoms can be classified based on their environment.
- In this case, all the hydrogen atoms are attached to tertiary carbon atoms (C2 and C3), which means they are equivalent due to the symmetrical nature of the molecule.

### Step 4: Count the Types of Hydrogen
Since all hydrogen atoms in this molecule are equivalent, there is only one type of hydrogen present.

### Step 5: Determine the Number of Monochloro Derivatives
When monochlorination occurs, one hydrogen atom is replaced by a chlorine atom. Since there is only one type of hydrogen in the molecule, only one unique monochloro derivative can be formed.

### Conclusion
Therefore, the number of possible monochloro derivatives of 2,2,3,3-tetramethylbutane is **1**.

### Final Answer
The correct answer is **D: 1**.

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