The number of tertiary hydrogens in 2, 3-dimethylbutane is

Explanation

To determine the number of tertiary hydrogens in 2,3-dimethylbutane, we will follow these steps:

### Step 1: Understand the Structure of 2,3-Dimethylbutane
- The name "2,3-dimethylbutane" indicates that we have a butane (which has 4 carbon atoms) as the main chain, with two methyl (−CH₃) groups attached to the second and third carbon atoms of the main chain.

### Step 2: Draw the Structure
- Draw the carbon backbone first:
```
C1 - C2 - C3 - C4
```
- Now, add the methyl groups:
- On carbon 2, add a −CH₃ group.
- On carbon 3, add another −CH₃ group.

The structure looks like this:
```
CH3
|
CH3 - C2 - C3 - CH2 - CH3
| |
CH3 CH3
```

### Step 3: Identify the Types of Carbons
- In organic chemistry, we classify carbons based on the number of other carbons (or substituents) they are bonded to:
- **Primary (1°) carbon**: bonded to one other carbon.
- **Secondary (2°) carbon**: bonded to two other carbons.
- **Tertiary (3°) carbon**: bonded to three other carbons.

### Step 4: Locate Tertiary Carbons
- In our structure:
- Carbon 1 (C1) is a primary carbon (bonded to one carbon).
- Carbon 2 (C2) is a tertiary carbon (bonded to three carbons: C1, C3, and the methyl group).
- Carbon 3 (C3) is also a tertiary carbon (bonded to three carbons: C2, C4, and the methyl group).
- Carbon 4 (C4) is a primary carbon (bonded to one carbon).

### Step 5: Count the Tertiary Hydrogens
- A tertiary hydrogen is attached to a tertiary carbon.
- For each tertiary carbon (C2 and C3), we need to count the number of hydrogen atoms:
- **C2**: Has 1 hydrogen (since it is bonded to 3 other groups).
- **C3**: Also has 1 hydrogen (for the same reason).

### Conclusion
- Therefore, the total number of tertiary hydrogens in 2,3-dimethylbutane is **2**.

### Final Answer
The number of tertiary hydrogens in 2,3-dimethylbutane is **2**.

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