Write the IUPAC names of isomers of `C_(2)H_(4)Cl_(2)`. Give one test to distinguish these.

Explanation

To solve the problem, we need to identify the isomers of the compound with the molecular formula \( C_2H_4Cl_2 \) and provide their IUPAC names. We will also discuss a method to distinguish between these isomers.

### Step 1: Identify the Isomers
The molecular formula \( C_2H_4Cl_2 \) indicates that we have two carbon atoms, four hydrogen atoms, and two chlorine atoms. The possible structural isomers can be categorized based on the arrangement of the chlorine atoms.

1. **Isomer 1: 1,1-Dichloroethane**
- Structure:
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