Which is the chemical test for polysaccharide

Options

A. Iodine solution
B. Ninhydrine test
C. Tollen’s test
D. Banedict solution

Answer

### Step-by-Step Solution:

1. **Understanding Polysaccharides**:
- Polysaccharides are complex carbohydrates that consist of long chains of monosaccharide units. Examples include starch, cellulose, and glycogen.

2. **Identifying Tests for Carbohydrates**:
- There are several chemical tests used to identify carbohydrates, including the ninhydrin test, Benedict's test, Tollens test, and iodine test.

3. **Ninhydrin Test**:
- The ninhydrin test is used to detect alpha amino acids, not polysaccharides. It produces a purple color in the presence of amino acids. Therefore, this test is not applicable for polysaccharides.

4. **Benedict's Test**:
- Benedict's test is used for detecting reducing sugars. Polysaccharides, such as starch, are generally non-reducing sugars. Hence, this test cannot confirm the presence of polysaccharides.

5. **Tollens Test**:
- Similar to Benedict's test, the Tollens test is also used for reducing sugars. Since polysaccharides are non-reducing, this test is also not suitable for identifying polysaccharides.

6. **Iodine Solution Test**:
- The iodine test is specific for polysaccharides. When iodine (I2) interacts with starch, it forms a blue complex, indicating the presence of polysaccharides. This blue color confirms the presence of starch, a type of polysaccharide.

7. **Conclusion**:
- The chemical test for polysaccharides is the iodine solution test, which produces a blue color in the presence of starch.

### Final Answer:
The chemical test for polysaccharides is the **iodine solution test**.

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