Which of the following statements is incorrect about DDT
I. DDT stands for dichlorodiphenyltrichloropropane and is an organochlorine insecticide .
II. DDT is soluble in water but insoluble in organic solvents.
III. High concentrations of DDT disturb calcium metabolism in birds, which causes thinning of eggshell and their premature breaking .
IV. In fish - eating birds, the DDT can ultimately reach a very high level of 25 ppm.

Options

A. II , III and IV
B. I and III
C. II and IV
D. I and II

Answer

To determine which statement about DDT is incorrect, we will analyze each statement one by one.

### Step 1: Analyze Statement I
**Statement I**: DDT stands for dichlorodiphenyltrichloropropane and is an organochlorine insecticide.

- **Analysis**: This statement is incorrect because DDT actually stands for dichlorodiphenyltrichloroethane, not dichlorodiphenyltrichloropropane. Therefore, this statement is false.

### Step 2: Analyze Statement II
**Statement II**: DDT is soluble in water but insoluble in organic solvents.

- **Analysis**: This statement is also incorrect. DDT is not soluble in water; it is actually soluble in organic solvents. Thus, this statement is false.

### Step 3: Analyze Statement III
**Statement III**: High concentrations of DDT disturb calcium metabolism in birds, which causes thinning of eggshell and their premature breaking.

- **Analysis**: This statement is correct. High levels of DDT do interfere with calcium metabolism in birds, leading to thinner eggshells and increased breakage.

### Step 4: Analyze Statement IV
**Statement IV**: In fish-eating birds, the DDT can ultimately reach a very high level of 25 ppm.

- **Analysis**: This statement is also correct. DDT can bioaccumulate in the food chain, leading to high concentrations in fish-eating birds.

### Conclusion
After analyzing all statements, we find that both Statement I and Statement II are incorrect. However, since the question asks for one incorrect statement, we can conclude that:

**The incorrect statement about DDT is Statement II**: DDT is soluble in water but insoluble in organic solvents.

### Final Answer
The answer is **Statement II**.

---