Which of the following anions is the best leaving group in an S_N1 reaction?

Name: Which of the following anions is the best leaving group in an S N 1 reaction?
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Question

Quizplus · Accepted Answer

In S_N1 reactions, the leaving group needs to be stable once it departs. In order for stability, the leaving group needs to be able to share the negative charge that develops once it leaves. Chloride ion (Cl-) is the best leaving group because it is able to stabilize the negative charge through resonance, making it the most likely to depart.

Which of the Following Anions Is the Best Leaving Group