Which of the following imparts green/apple green colour to the Bunsen flame ?

Options

A. Calcium chloride
B. Volatile boron trifluoride
C. Barium chloride
D. Ethyl borate

Explanation

To determine which of the given compounds imparts a green or apple green color to the Bunsen flame, we can analyze each option step by step.

### Step-by-Step Solution:

1. **Identify the Compounds**: The compounds given are:
- Calcium chloride (CaCl₂)
- Volatile boron trifluoride (BF₃)
- Barium chloride (BaCl₂)
- Ethyl borate (B(OC₂H₅)₃)

2. **Test Each Compound in Bunsen Flame**:
- **Calcium Chloride**: When calcium chloride is heated in a Bunsen flame, it imparts a **brick red color** due to the presence of calcium ions (Ca²⁺).
- **Volatile Boron Trifluoride**: This compound gives a **green color** when heated in the flame.
- **Barium Chloride**: Barium chloride produces an **apple green color** in the flame.
- **Ethyl Borate**: When ethyl borate is heated, it shows a **green edge flame color**, which indicates a greenish hue primarily at the edges of the flame.

3. **Conclusion**:
- From the observations:
- Calcium chloride does not impart a green color.
- Volatile boron trifluoride imparts a green color.
- Barium chloride imparts an apple green color.
- Ethyl borate imparts a green edge flame color.
- Therefore, the compounds that impart green or apple green color to the Bunsen flame are **volatile boron trifluoride, barium chloride, and ethyl borate**.

### Final Answer:
The compounds that impart green or apple green color to the Bunsen flame are **volatile boron trifluoride, barium chloride, and ethyl borate**.

---