Which of the following statements is incorrect about fats ?

Options

A. Lipids are strictly macromolecules
B. Palmitic acid has 16 carbons including carboxyl carbon
C. Oil have low melting point and hence remain as oil in winters
D. Arachidonic acid is an unsaturated fatty acid

Answer

To determine which statement is incorrect about fats, we need to analyze the provided statements one by one.

### Step-by-Step Solution:

1. **Understand the Nature of Lipids**:
- Lipids, including fats, are a diverse group of compounds that are generally hydrophobic (water-repelling).
- They are not strictly classified as macromolecules because macromolecules typically have a molecular weight greater than 1000 Daltons.

2. **Evaluate the First Statement**:
- The first statement claims that "lipids are strictly macromolecules."
- This statement is incorrect because lipids can have molecular weights less than 800 Daltons and are not strictly classified as macromolecules.

3. **Evaluate the Second Statement**:
- The second statement mentions that "Palmitic acid is a 16 carbon acid including the carboxyl carbon."
- This statement is correct. Palmitic acid (C16:0) is indeed a saturated fatty acid with 16 carbon atoms.

4. **Evaluate the Third Statement**:
- The third statement states that "oils have low melting points and hence remain as oils in winters."
- This statement is also correct. Oils are typically unsaturated fats, which have lower melting points compared to saturated fats.

5. **Evaluate the Fourth Statement**:
- The fourth statement claims that "arachidonic acid is an unsaturated fatty acid."
- This statement is correct as well. Arachidonic acid has 20 carbon atoms and contains multiple double bonds, making it an unsaturated fatty acid.

6. **Conclusion**:
- Among the statements evaluated, the only incorrect statement is the first one: "lipids are strictly macromolecules." Therefore, this is the answer to the question.

### Final Answer:
The incorrect statement about fats is: "lipids are strictly macromolecules."

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