Give three examples in which green chemistry has been applied ?

Explanation

### Step-by-Step Solution:

1. **Introduction to Green Chemistry:**
- Green chemistry is a branch of chemistry that focuses on designing chemical products and processes that reduce or eliminate the use and generation of hazardous substances. Its goal is to create sustainable and environmentally friendly practices in the chemical industry.

2. **Example 1: Dry Cleaning with Liquefied CO2**
- In traditional dry cleaning, a solvent called tetrachloroethylene (C2Cl4) is commonly used. This chemical is harmful to both human health and the environment.
- Green chemistry has introduced the use of liquefied carbon dioxide (CO2) as an alternative solvent for dry cleaning. CO2 is non-toxic, non-flammable, and can be recycled in the process, making it a safer and more sustainable option.
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