Which of the following statements is false?

Options

A. The repeat unit in natural rubber is isoprene
B. Both starch and cellulose are polymers of glucose
C. Artificial silk is derived from cellulose
D. Nylon -66 is an example of elastomer

Answer

To determine which statement is false among the given options, we will analyze each statement one by one.

### Step 1: Analyze the first statement
**Statement 1:** The repeat unit in natural rubber is isoprene.

- Natural rubber is indeed a polymer made from the monomer isoprene (2-methyl-1,3-butadiene).
- The repeating unit in natural rubber is polyisoprene, derived from isoprene.

**Conclusion:** This statement is **true**.

### Step 2: Analyze the second statement
**Statement 2:** Both starch and cellulose are polymers of glucose.

- Starch and cellulose are both polysaccharides composed of glucose units.
- Starch is made up of amylose and amylopectin, both of which are polymers of glucose.
- Cellulose is also a polymer of glucose, specifically β-glucose.

**Conclusion:** This statement is **true**.

### Step 3: Analyze the third statement
**Statement 3:** Artificial silk is derived from cellulose.

- Artificial silk, commonly known as rayon, is indeed derived from cellulose through a process of regeneration.

**Conclusion:** This statement is **true**.

### Step 4: Analyze the fourth statement
**Statement 4:** Nylon 66 is an example of elastomer.

- Nylon 66 is a type of polyamide formed from the condensation reaction of adipic acid and hexamethylene diamine.
- It is known for its strength and durability but does not exhibit the elastic properties characteristic of elastomers.
- Elastomers are typically long-chain polymers that exhibit significant elasticity due to their cross-linked structure, which is not the case for nylon 66.

**Conclusion:** This statement is **false**.

### Final Answer
The false statement is **Statement 4:** Nylon 66 is an example of elastomer.

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