The most volatile compound is

Options

A. 2,2-dimethyl propane
B. 2-methyl butane
C. Isobutane
D. n-pentane

Answer

To determine the most volatile compound among the given options, we need to analyze the boiling points of each compound based on their structure and branching. The boiling point of hydrocarbons is inversely proportional to the degree of branching; more branches generally lead to lower boiling points, which indicates higher volatility.

### Step-by-Step Solution:

1. **Understanding Volatility**:
- Volatility refers to how easily a substance vaporizes. A compound with a lower boiling point is considered more volatile.

2. **Analyzing the Compounds**:
- We have four compounds to analyze:
1. **2,2-Dimethylpropane**
2. **2-Methylbutane**
3. **Isobutane**
4. **Normal Pentane**

3. **Identifying the Structure of Each Compound**:
- **2,2-Dimethylpropane**: This compound has two branches.
- **2-Methylbutane**: This compound has one branch.
- **Isobutane**: This is also known as 2-methylpropane, which has one branch.
- **Normal Pentane**: This compound has no branches.

4. **Comparing the Number of Branches**:
- More branches typically mean a lower boiling point.
- 2,2-Dimethylpropane has the most branches (2 branches), followed by 2-Methylbutane and Isobutane (1 branch each), and Normal Pentane has no branches.

5. **Conclusion on Boiling Points**:
- Since 2,2-Dimethylpropane has the highest number of branches, it will have the lowest boiling point, making it the most volatile compound among the options.

6. **Final Answer**:
- Therefore, the most volatile compound is **2,2-Dimethylpropane**.