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Which of the following ions is considered the best leaving group in nucleophilic substitution reactiReaction Mechanism Chemistry Question

Question

Which of the following ions is considered the best leaving group in nucleophilic substitution reactions under neutral conditions?

Answer: C

💡 Solution & Explanation

The best leaving groups are the weakest bases (conjugate bases of strong acids). Since $HI$ is the strongest acid, $I^-$ is the weakest base and an excellent leaving group.

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