Assign the `R` and `S` configurations to the enantiomers of 2-chlorobutane.

Explanation

To assign the `R` and `S` configurations to the enantiomers of 2-chlorobutane, we will follow these steps:

### Step 1: Draw the Structure of 2-Chlorobutane
2-chlorobutane has a four-carbon chain (butane) with a chlorine atom attached to the second carbon. The structure can be represented as follows:

```
CH3
|
...