Which of the following anions is the most nucleophilic in polar protic solvents?

Name: Which of the following anions is the most nucleophilic in polar protic solvents?
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Question

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Nucleophilicity increases as we move down the halogen group in periodic table due to increase in size and ability to polarize electron density. Among the given anions, I- has the largest size and therefore it is the most nucleophilic in polar protic solvents.

Which of the Following Anions Is the Most Nucleophilic in Polar