The incorrect statement regarding cellulose is

Options

A. it is a polymer of D-glucose
B. It has `beta-1,4-` glycosidic linkage
C. it is used for making rayon fibre
D. it can be obtained by polymerisation of D-glucose in the lab.

Answer

To determine the incorrect statement regarding cellulose, let's analyze the properties and characteristics of cellulose step by step.

### Step 1: Understanding Cellulose
Cellulose is a natural polymer made up of repeating units of D-glucose. It is primarily found in the cell walls of plants, providing structural support.

**Hint:** Remember that cellulose is a polymer composed of glucose units.

### Step 2: Structure of Cellulose
The structure of cellulose consists of beta-D-glucose units linked together by beta 1,4-glycosidic linkages. This means that the hydroxyl group on the first carbon of one glucose unit is linked to the fourth carbon of the next glucose unit.

**Hint:** Focus on the specific type of glycosidic linkage that characterizes cellulose.

### Step 3: Properties of Cellulose
- Cellulose is insoluble in water.
- It is used in the production of paper and textiles.
- It cannot be digested by humans due to the lack of enzymes to break down the beta 1,4 linkages.

**Hint:** Consider the common uses and properties of cellulose in various industries.

### Step 4: Analyzing the Statements
Now, let's evaluate the statements provided in the question:

1. **Cellulose is a polymer of D-glucose.** (True)
2. **Cellulose consists of beta-D-glucose units.** (True)
3. **Cellulose has beta 1,4-glycosidic linkages.** (True)
4. **Cellulose can be synthesized in the lab from D-glucose.** (False)

**Hint:** Identify which statement contradicts the natural occurrence of cellulose.

### Step 5: Conclusion
The incorrect statement regarding cellulose is that it can be synthesized in the lab from D-glucose. Cellulose is a natural polymer that occurs in nature and cannot be synthesized artificially in a laboratory setting.

**Final Answer:** The incorrect statement regarding cellulose is that it can be synthesized in the lab from D-glucose.