Which one of the following is false?

Options

A. Fatty acid and glycerol are soluble in water
B. Phospholipids are found in the cell membrane
C. In lipid R group may be-`CH_(3)` group, -`C_(2)H_(5)` group or higher number of -`CH_(2)` group (1 to 19 carbon)
D. Oils have lower melting temperature

Answer

To determine which statement is false among the given options, we will analyze each statement one by one based on the information provided in the video transcript.

### Step-by-Step Solution:

1. **Analyze the First Statement:**
- The statement claims that "Fatty acid and Glycerol are soluble in water, but Glycerol is insoluble in water."
- This statement is incorrect because glycerol is actually soluble in water due to its three hydroxyl (-OH) groups that can form hydrogen bonds with water. However, fatty acids have a long hydrophobic tail, making them generally insoluble in water.
- **Conclusion:** This statement is false.

2. **Analyze the Second Statement:**
- The statement says, "Phospholipids are found in the cell membrane."
- This statement is true. Phospholipids are indeed a major component of cell membranes, forming a lipid bilayer that is essential for cell structure and function.
- **Conclusion:** This statement is true.

3. **Analyze the Third Statement:**
- The statement mentions, "In lipid R group, CH3 group, ethyl group or higher number of CH2 group."
- This statement is also true. The R group in lipids can vary and can include methyl (CH3), ethyl, or longer hydrocarbon chains (higher number of CH2 groups).
- **Conclusion:** This statement is true.

4. **Analyze the Fourth Statement:**
- The statement states, "Oils have lower melting temperature."
- This statement is true. Oils are typically liquid at room temperature, while fats are solid, indicating that oils have a lower melting point compared to fats.
- **Conclusion:** This statement is true.

### Final Conclusion:
Based on the analysis, the false statement is the first one: "Fatty acid and Glycerol are soluble in water, but Glycerol is insoluble in water." Therefore, the correct answer is option number 1.

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