Iodine test can detect the presence of

Options

A. Starch
B. Cellulose
C. Both (1) & (2)
D. Chitin

Answer

### Step-by-Step Solution:

1. **Understanding the Iodine Test**: The iodine test is a chemical test used to detect the presence of starch in a sample. It is based on the reaction between iodine and starch.

2. **Procedure of the Iodine Test**: To perform the iodine test, a small amount of the sample (which may contain starch) is placed in a test tube. A few drops of a 1% iodine solution are then added to the sample.

3. **Observation of Color Change**:
- If starch is present in the sample, the iodine will react with it, resulting in a color change. The solution will turn a dark blue, purple, or blackish color.
- If starch is not present, the color of the iodine solution will remain pale yellow, which is its original color.

4. **Conclusion from the Test**: Since the iodine test specifically detects starch, we can conclude that the presence of starch is indicated by the color change to dark blue, purple, or blackish.

5. **Analyzing the Options**:
- **Starch**: Correct, as the iodine test specifically detects starch.
- **Cellulose**: Incorrect, as the iodine test does not detect cellulose despite it being a polysaccharide.
- **Both 1 and 2**: Incorrect, as only starch is detected.
- **Chitin**: Incorrect, as chitin is not detected by the iodine test.

6. **Final Answer**: The iodine test can detect the presence of **starch**.