Assertion: 2,2-Dimethylbutane does not have any tertiary carbon atom.
Reason: Tertiary carbon atom is attached to three carbon atoms.

Options

A. If both assertion and reson are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Answer

To solve the question regarding the assertion and reason about 2,2-Dimethylbutane and tertiary carbon atoms, let's break it down step by step.

### Step 1: Understand the Structure of 2,2-Dimethylbutane
2,2-Dimethylbutane is a branched alkane with the following structure:
- The main chain is butane (4 carbon atoms).
- There are two methyl (−CH₃) groups attached to the second carbon of the butane chain.

The structure can be represented as:
```
CH3
|
CH3 - C - CH2 - CH3
|
CH3
```
In this structure, we can identify the types of carbon atoms based on how many other carbon atoms they are bonded to.

### Step 2: Identify the Types of Carbon Atoms
- **Primary Carbon (1°)**: A carbon atom bonded to one other carbon atom.
- **Secondary Carbon (2°)**: A carbon atom bonded to two other carbon atoms.
- **Tertiary Carbon (3°)**: A carbon atom bonded to three other carbon atoms.
- **Quaternary Carbon (4°)**: A carbon atom bonded to four other carbon atoms.

In the structure of 2,2-Dimethylbutane:
- The two terminal carbon atoms (CH₃) are primary (1°) because they are bonded to only one carbon.
- The second carbon (the one with the two methyl groups) is a quaternary (4°) carbon because it is bonded to four other carbon atoms (two methyl groups and two other carbons from the butane chain).
- The third carbon (CH₂) is a secondary (2°) carbon because it is bonded to two other carbon atoms.

### Step 3: Conclusion about Tertiary Carbon Atoms
From the analysis, we can conclude:
- There are no tertiary (3°) carbon atoms in 2,2-Dimethylbutane.

### Step 4: Evaluate the Assertion and Reason
- **Assertion**: 2,2-Dimethylbutane does not have any tertiary carbon atom. (True)
- **Reason**: A tertiary carbon atom is attached to three carbon atoms. (True)

Since the assertion is true and the reason correctly explains the assertion, both statements are true.

### Final Answer
Both the assertion and reason are true, and the reason correctly explains the assertion.

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