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:** The repetitive unit in natural rubber is isoprene.

**Analysis:**
Natural rubber is indeed a polymer made from the monomer isoprene (2-methyl-1,3-butadiene). The polymerization of isoprene leads to the formation of polyisoprene, which is the main component of natural rubber.

**Conclusion:** This statement is true.

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

**Analysis:**
Starch and cellulose are both polysaccharides made from glucose units. Starch is composed of amylose and amylopectin, which are polymers of α-D-glucose, while cellulose is made up of β-D-glucose units.

**Conclusion:** This statement is true.

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

**Analysis:**
Artificial silk, also known as rayon, is indeed derived from cellulose. Cellulose is processed to produce a fiber that resembles silk, making this statement accurate.

**Conclusion:** This statement is true.

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

**Analysis:**
Nylon 66 is not an elastomer; it is a type of synthetic fiber. It is formed from the polymerization of hexamethylene diamine and adipic acid. Elastomers are characterized by their ability to stretch and return to their original shape, while nylon 66 has strong intermolecular forces and is used primarily in textiles and engineering applications.

**Conclusion:** This statement is false.

### Final Conclusion
The false statement among the options provided is:
**D: Nylon 66 is an example of elastomer.**

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