Which of the following are isomers?

Options

A. ethane and propane
B. ethane and ethene
C. ethene and ethyne
D. butane and isobutane

Explanation

To determine which of the given compounds are isomers, we need to follow these steps:

### Step 1: Understand the Definition of Isomers
Isomers are compounds that have the same molecular formula but different structural formulas. This means they contain the same number of atoms of each element but are arranged differently.

**Hint:** Remember that isomers must have the same molecular formula but different structures.

### Step 2: Identify the Molecular Formulas of the Given Compounds
Let’s consider the compounds mentioned in the video transcript:
- Ethane (C2H6)
- Ethene (C2H4)
- Ethyne (C2H2)
- Butane (C4H10)
- Isobutane (C4H10)

**Hint:** Write down the molecular formulas of each compound to compare them.

### Step 3: Compare Molecular Formulas
Now, we will compare the molecular formulas:
- Ethane (C2H6) and Ethene (C2H4) have different formulas.
- Ethene (C2H4) and Ethyne (C2H2) have different formulas.
- Butane (C4H10) and Isobutane (C4H10) have the same formula.

**Hint:** Look for compounds that share the same molecular formula.

### Step 4: Analyze the Structures
Next, we need to analyze the structures of the compounds:
- Butane has a straight-chain structure.
- Isobutane has a branched structure.

Since both Butane and Isobutane have the same molecular formula (C4H10) but different structures, they are isomers.

**Hint:** Draw the structures if necessary to visualize the differences.

### Step 5: Conclusion
Based on the analysis, the only pair of compounds that are isomers are Butane and Isobutane.

**Final Answer:** Butane and Isobutane are isomers.