Substances which can be stretched to cause large strairs are called

Options

A. isomers
B. plastomers
C. elastomers
D. polymers

Explanation

To solve the question "Substances which can be stretched to cause large strains are called," we will analyze the options provided and determine the correct answer step by step.

### Step 1: Understand the Terms
We need to understand the definitions of the terms given in the options:
- **Isomers**: These are compounds with the same molecular formula but different structural arrangements. They are not related to mechanical properties.
- **Plastomers**: These are a type of plastic that can be molded and shaped but have a limited ability to stretch. They do not exhibit large strains.
- **Elastomers**: These are polymers that have significant elasticity. They can be stretched to large strains and return to their original shape when the stress is removed.
- **Polymers**: This is a broad category that includes many substances, including elastomers and plastomers, but does not specifically refer to those that can be stretched to large strains.

### Step 2: Analyze the Options
From the definitions:
- **Isomers** do not relate to stretching or strain.
- **Plastomers** have limited stretchability.
- **Elastomers** can be stretched significantly and return to their original shape.
- **Polymers** are too general and do not specify the ability to stretch.

### Step 3: Identify the Correct Answer
Based on the definitions and analysis:
- The correct answer is **Elastomers** because they are specifically designed to be stretched to large strains and have high elasticity.

### Final Answer
Substances which can be stretched to cause large strains are called **Elastomers**.

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