Mucilages are polysaccharides formed from galactose and mannose, they are slimy substance. Which one of the following is not a mucilage?
(a) Agar
(b) Algninc acid
(c) Rayon
(d) Carrageen

Options

A. Agar
B. Algninc acid
C. Rayon
D. compound

Answer

To determine which of the following options is not a mucilage, we need to understand what mucilages are and the nature of each option provided.

1. **Understanding Mucilages**: Mucilages are polysaccharides primarily composed of galactose and mannose. They are known for their slimy texture and are often derived from algae.

2. **Analyzing the Options**:
- **(a) Agar**: Agar is a gelatinous substance derived from red algae, specifically from the genera Gracilaria and Gelidium. It is a mucilage.
- **(b) Alginic acid**: Alginic acid is also obtained from brown algae and is a polysaccharide that forms a gel-like substance. It is classified as a mucilage.
- **(c) Rayon**: Rayon is a synthetic fiber made from regenerated cellulose. It is not derived from polysaccharides like galactose and mannose and does not have the slimy texture characteristic of mucilages. Therefore, it is not a mucilage.
- **(d) Carrageen**: Carrageenan is a substance extracted from red algae and is used as a thickening agent. It is a type of mucilage.

3. **Conclusion**: Based on the analysis, the option that is not a mucilage is **(c) Rayon**.

### Final Answer:
**(c) Rayon**