1. 1,1-Dichloropropane
```
Cl
|
CH3-CH-CH2Cl
```
2. 1,2-Dichloropropane
```
Cl Cl
| |
CH3-CH-CH2
```
3. 1,3-Dichloropropane
```
Cl Cl
| |
CH2-CH2-CH2
```
4. 2,2-Dichloropropane
```
Cl
|
CH3-C-CH3
|
Cl
```
Explanation:
* Isomers are molecules with the same molecular formula but different arrangements of atoms.
* Structural Isomers have different connectivity of atoms.
In these isomers, the chlorine atoms can be placed on different carbon atoms of the propane backbone, leading to the four different structures shown above.
