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Which of the following sequences correctly represents the trend of increasing nucleophilicity as you move down the halogen group in the periodic table?

1. I⁻ > Br⁻ > Cl⁻ > F⁻
2. Br⁻ > I⁻ > Cl⁻ > F⁻
3. Cl⁻ > Br⁻ > I⁻ > F⁻
4. F⁻ > Cl⁻ > Br⁻ > I⁻

Correct answer: I⁻ > Br⁻ > Cl⁻ > F⁻

Solution

Nucleophilicity increases down the periodic table due to the larger size and greater polarizability of the anions, making I⁻ the strongest nucleophile among the halides.

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