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For (i) I−, (ii) Cl−, (iii) Br−, the increasing order of nucleophilicity would be:

1. Cl− < Br− < I−
2. Br− < Cl− < I−
3. Br− < I− < Cl−
4. I− < Br− < Cl−

Correct answer: Cl− < Br− < I−

Solution

Nucleophilicity increases down the group in the periodic table due to the larger size and higher polarizability of the halide ions. Hence, I− is the most nucleophilic, followed by Br−, and then Cl−.

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