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Haloalkanes and Haloarenes — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryHaloalkanes and Haloarenes1 Mark
Question
Which is a strong nucleophile, a $Br -$ or an $I ^{-}$ and why?
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Answer

$I ^{-}$is a strong nucleophile because the size of $I ^{-}$ is large and its electronegativity is less than $Br ^{-}$, hence it has tendency to donate electron pair greater.

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