Answer
Bromide is a better leaving group.
Work Step by Step
1. Identify the possibles leaving groups:
- $Tosylate$ ($OTs$)
- $Bromide$ ($Br^-$)
2. Determine which one is better.
- If we analyze the image on page 218, we will see that, bromide is more stable than tosylate (The group with a sulfur).
Therefore, $Br^-$ is a better leaving group.
