Which one of the following has the minimum boiling point?

Options

A. n-Butane
B. Isobutane
C. 1-Butene
D. 1-Butyne

Explanation

To determine which compound has the minimum boiling point among the options provided, we can follow these steps:

### Step 1: Understand Boiling Points
Boiling points of hydrocarbons are influenced by their molecular structure, particularly the type of bonds present (single, double, or triple) and the branching of the carbon chain.

### Step 2: Identify Types of Hydrocarbons
- **Alkynes** (triple bonds) generally have higher boiling points due to stronger bond interactions.
- **Alkenes** (double bonds) have lower boiling points than alkynes but higher than alkanes.
- **Alkanes** (single bonds) have varying boiling points based on their structure:
- **Normal alkanes** (straight-chain) have higher boiling points than **branched alkanes**.

### Step 3: Compare the Given Options
Assuming the options include:
1. Butane (C4H10) - a straight-chain alkane
2. Isobutane (C4H10) - a branched alkane
3. 1-Butene (C4H8) - an alkene
4. 1-Butyne (C4H6) - an alkyne

### Step 4: Analyze the Boiling Points
- **Butane** (C4H10) has a higher boiling point than isobutane due to its straight-chain structure.
- **Isobutane** (C4H10) has a lower boiling point than butane because it is branched.
- **1-Butene** (C4H8) has a boiling point lower than butane but higher than isobutane.
- **1-Butyne** (C4H6) has the highest boiling point among the alkenes and alkynes due to the presence of a triple bond.

### Step 5: Conclusion
From the analysis, **isobutane** has the minimum boiling point among the options provided.

### Final Answer
The compound with the minimum boiling point is **isobutane**.

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