All the members of a homologus series have same

Options

A. Functional group
B. Empirical formula
C. General formula
D. All of these

Answer

To answer the question "All the members of a homologous series have the same...", we can follow these steps:

### Step-by-Step Solution:

1. **Define Homologous Series**:
A homologous series is a group of organic compounds that have the same functional group and differ from each other by a constant unit, typically a -CH2- group.

2. **Identify Characteristics of Homologous Series**:
- Members differ by a -CH2- unit.
- They have the same functional group.
- They follow a general formula.

3. **General Formula**:
For alkanes, the general formula is CnH2n+2, where n is the number of carbon atoms. This means that as you move through the series, the number of hydrogen atoms increases in a predictable manner.

4. **Empirical Formula**:
While the empirical formula may differ among members of the series, the general formula remains consistent across the series.

5. **Conclusion**:
Therefore, the correct answer to the question is that all members of a homologous series have the same **general formula** and the same **functional group**.

### Final Answer:
All the members of a homologous series have the same **general formula** and the same **functional group**.

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