For the species (I−,Cl−,Br−), the increasing order of nucleophilicity in water would be:
A
I–<Cl–<Br–
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B
Br–<Cl–<I–
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C
I–<Br–<Cl–
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D
Cl–<Br–<I–
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Solution
The correct option is DCl–<Br–<I– H2O is a polar solvent. Nucleophilicity∝size Smaller the size of anion, more it will be hydrated by H2O and less will be the nucleophilicity. Hence, the order is: Cl–<Br–<I–