Can homologues be isomers?

Options

A. Yes
B. No
C. Sometimes
D. None of these

Explanation

### Step-by-Step Solution

1. **Understanding Isomers**:
- Isomers are compounds that have the same molecular formula but different structural arrangements of atoms. This means that while they contain the same number of each type of atom, the way those atoms are connected or arranged differs.

2. **Defining Homologous Series**:
- A homologous series is a group of organic compounds that have a similar structure and similar chemical properties. The key characteristic of a homologous series is that each successive member differs from the previous one by a specific unit, which is typically a -CH2- group (methylene group).

3. **Examining the Relationship**:
- Since members of a homologous series differ by a -CH2- group, this means that each member has a different molecular formula. For example, in the alkene homologous series, the general formula is CnH2n. If we take n=2, we get C2H4 (ethene), and for n=3, we get C3H6 (propene). These two compounds have different molecular formulas.

4. **Conclusion**:
- Since isomers must have the same molecular formula, and homologues differ in their molecular formulas (due to the addition of -CH2- groups), we can conclude that homologues cannot be isomers. Therefore, the answer to the question "Can homologues be isomers?" is **No**.

### Final Answer
No, homologues cannot be isomers because they have different molecular formulas.