Which of the following practices will not come under green chemistry

Options

A. If possible, making use of soap made of vegetable oils instead of using synthetic detergents.
B. Using `H_(2)O_(2)` for bleaching purpose instead of using chlorine based bleaching agents
C. Using bicycle for travelling small distances instead of using petrol/diesel based vehicles
D. Using plastic cans for neatly storing substances.

Explanation

To determine which practice does not come under green chemistry, we need to understand the principles of green chemistry. Green chemistry focuses on designing chemical processes and products that minimize the use and generation of hazardous substances. Let's analyze each option provided in the question:

### Step-by-Step Solution:

1. **Understanding Green Chemistry**:
- Green chemistry aims to reduce or eliminate the use of harmful substances in chemical processes and products. It promotes the use of environmentally friendly materials and methods.

2. **Analyzing Option A**:
- **Using soap made from vegetable oils**:
- Vegetable oils are biodegradable and eco-friendly compared to synthetic detergents. This practice aligns with green chemistry principles.
- **Conclusion**: This practice comes under green chemistry.

3. **Analyzing Option B**:
- **Using H2O2 for bleaching instead of chlorine-based agents**:
- Hydrogen peroxide (H2O2) is a more environmentally friendly bleaching agent compared to chlorine, which can produce harmful byproducts.
- **Conclusion**: This practice is also part of green chemistry.

4. **Analyzing Option C**:
- **Using a bicycle for short distances instead of petrol or diesel vehicles**:
- Bicycles do not produce emissions and are a sustainable mode of transport, promoting a reduction in pollution.
- **Conclusion**: This practice is consistent with green chemistry principles.

5. **Analyzing Option D**:
- **Using plastic containers for storage**:
- Plastic is not biodegradable and contributes to environmental pollution. This practice does not align with the principles of green chemistry.
- **Conclusion**: This practice does not come under green chemistry.

### Final Answer:
- The practice that does not come under green chemistry is **Option D: Using plastic containers for storing substances**.