Which of the following is not obtained from algae ?

Options

A. Mannitol
B. Carrageen
C. Algin
D. Peat

Answer

To solve the question "Which of the following is not obtained from algae?" we will analyze each of the options provided.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are mannitol, carrageenan, algin, and peat.

2. **Understand Each Substance**:
- **Mannitol**: This is a sugar alcohol that is commonly found in certain algae, particularly brown algae. It serves as a form of stored food.
- **Carrageenan**: This is a thickening agent derived from red algae. It is widely used in food products and cosmetics.
- **Algin**: This is a substance obtained from brown algae and is used as a thickener and stabilizer in various products.
- **Peat**: This is an accumulation of partially decayed vegetation or organic matter that is typically formed in waterlogged conditions. It is not derived from algae but rather from mosses and other plant materials.

3. **Determine Which is Not Obtained from Algae**:
- Mannitol, carrageenan, and algin are all substances that can be obtained from algae.
- Peat, however, is not derived from algae; it is formed from the decomposition of plant materials, primarily mosses.

4. **Conclusion**: The substance that is not obtained from algae is **peat**.

### Final Answer: Peat

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