Which of the following statements is not correct?

Options

A. A common functional group is present in different members of a homologous series.
B. Two consecutive members of a homologous series differ by a `-CH_(3)` group.
C. The members of a homologous series can be represented by one general formula.
D. Different members of a homologous series have similar chemical properties.

Explanation

To determine which of the following statements is not correct regarding homologous series, let's analyze the given statements one by one:

1. **Homologous series consists of organic compounds that have the same functional group.**
- This statement is correct. Homologous series are defined by having the same functional group, which gives them similar chemical properties.

2. **Consecutive members differ by a -CH2- group.**
- This statement is also correct. In a homologous series, each consecutive member differs from the previous one by a -CH2- group (which is equivalent to 14 AMU).

3. **Members of the homologous series have the same chemical properties.**
- This statement is partially correct. While members of a homologous series exhibit similar chemical properties due to the presence of the same functional group, they may have different physical properties.

4. **Members of the homologous series can be represented by the same general formula.**
- This statement is correct. Each homologous series can be represented by a general formula, such as CnH2n+2 for alkanes.

Now, let's identify the incorrect statement.

Upon reviewing the statements, we can conclude that:
- The statement regarding the difference between consecutive members being -CH2- is correct, but the video transcript mentions a difference of 40 AMU, which is incorrect. The correct difference is 14 AMU, not 40 AMU.

Thus, the statement that is not correct is the one that claims that consecutive members differ by 40 AMU.

### Summary of Steps:
1. Identify the definition of a homologous series.
2. Analyze each statement regarding the properties of homologous series.
3. Determine which statement does not align with the established facts about homologous series.