Which of the following practices will not come under green chemistry?

Options

A. If possible, making use of soap made of vegatable 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 distance instead of using petrol/diesel baseed vehicales.
D. Using plastic can for neatly storing substances

Explanation

To determine which practice does not fall under green chemistry, we need to evaluate each option based on the principles of green chemistry, which emphasizes the use of non-polluting and sustainable materials.

### Step-by-Step Solution:

1. **Understanding Green Chemistry**:
- Green chemistry focuses on reducing pollution and using sustainable, non-toxic materials. It promotes practices that are environmentally friendly and minimize waste.

2. **Evaluating Each Option**:
- **Option 1**: Using soap made with vegetable oil instead of synthetic detergent.
- **Analysis**: Vegetable oil soaps are biodegradable and less harmful to the environment compared to synthetic detergents, which are often non-biodegradable and polluting.
- **Conclusion**: This practice is in line with green chemistry.

- **Option 2**: Using H2O2 (hydrogen peroxide) for bleaching instead of chlorine-based agents.
- **Analysis**: Hydrogen peroxide is a more environmentally friendly bleaching agent compared to chlorine, which can produce harmful by-products.
- **Conclusion**: This practice is also in line with green chemistry.

- **Option 3**: Using a bicycle for traveling small distances instead of petrol or diesel vehicles.
- **Analysis**: Bicycles do not emit pollutants and are a sustainable mode of transport compared to fossil fuel-based vehicles.
- **Conclusion**: This practice is consistent with green chemistry.

- **Option 4**: Using plastic cans for storing substances.
- **Analysis**: Plastic is non-biodegradable and can release harmful substances when disposed of improperly. It contributes to pollution and environmental degradation.
- **Conclusion**: This practice does not align with the principles of green chemistry.

3. **Final Answer**:
- The practice that does not come under green chemistry is **using plastic cans for neatly storing substances**.