Which of these is a synthetic fibre that readily burns with a bright yellow flame?

Options

A. Acrylic
B. Cotton
C. Nylon
D. Rayon

Explanation

To answer the question "Which of these is a synthetic fibre that readily burns with a bright yellow flame?", we need to follow a systematic approach:

### Step-by-Step Solution:

1. **Identify Synthetic Fibres**: First, we need to understand what synthetic fibres are. Synthetic fibres are man-made fibres produced from chemical substances. Common examples include nylon, polyester, and acrylic.

2. **Understand Flame Characteristics**: Next, we should know the characteristics of burning synthetic fibres. When synthetic fibres burn, they can produce different flame colors. A bright yellow flame typically indicates the presence of carbon, which is often associated with certain types of synthetic fibres.

3. **Analyze Options**: If we had options, we would analyze each one to see which one is known for burning with a bright yellow flame. For instance:
- **Nylon**: Burns with a yellow flame but can also produce a melting effect.
- **Polyester**: Burns with a more subdued flame and may not produce a bright yellow flame.
- **Acrylic**: Often burns with a bright yellow flame and can produce a sooty residue.

4. **Conclusion**: Based on the characteristics of the flames produced by these fibres, we can conclude that **Acrylic** is a synthetic fibre that readily burns with a bright yellow flame.

### Final Answer:
The synthetic fibre that readily burns with a bright yellow flame is **Acrylic**.

---