Answer
The chloride is a better leaving group.
Work Step by Step
1. Identify the possibles leaving groups:
- $EtO^-$ ($CH_3CH_2O^-$)
- $Chloride$ ($Cl^-$)
2. Determine which one is better.
- In this section, we've learned that halides, like chloride, are good leaving groups (page 219).
- And we have also learned that, the $CH_3CH_2O^-$ is a bad leaving group (page 218).
Therefore, chloride is better.
