1-Butene and cyclobutane show

Options

A. position isomerism
B. ring-chain isomerism
C. functional isomerism
D. metamerism

Answer

To solve the question regarding the relationship between 1-butene and cyclobutane, we need to analyze the structures of both compounds and identify the type of isomerism they exhibit.

### Step-by-Step Solution:

1. **Identify the Structures**:
- **1-Butene**: This is an alkene with the formula C₄H₈. Its structure can be represented as:
\[ CH_2=CH-CH_2-CH_3 \]
- **Cyclobutane**: This is a cyclic alkane with the same molecular formula C₄H₈. Its structure is a ring of four carbon atoms:
\[ \text{Cyclic structure: } \text{(C)}_4 \]

2. **Determine the Type of Isomerism**:
- **Ring-Chain Isomerism**: This occurs when one compound is a cyclic structure (like cyclobutane) and the other is an acyclic structure (like 1-butene). Since 1-butene is a straight-chain alkene and cyclobutane is a ring structure, they are classified as ring-chain isomers.

3. **Eliminate Other Options**:
- **Position Isomers**: This type of isomerism involves the same molecular formula but different positions of functional groups or double bonds. Since both compounds have different structures (one is cyclic and the other is acyclic), they do not qualify as position isomers.
- **Functional Isomers**: These are compounds with the same molecular formula but different functional groups. Since both compounds are hydrocarbons with no functional group differences, they are not functional isomers.
- **Metamers**: This type of isomerism involves compounds with the same functional group but different alkyl groups. Since both compounds do not share a functional group, they are not metamers.

4. **Conclusion**:
- Based on the analysis, the correct classification for the relationship between 1-butene and cyclobutane is that they are **ring-chain isomers**.

### Final Answer:
**B) Ring-chain isomers**

---