Answer
$I^-$ is the better nucleophile.
Work Step by Step
$I^-$ is larger and more ploarizable than $Cl^-$, so it is a better nucleophile in the $S_N2$ reaction.
Organic Chemistry (8th Edition)
by Wade Jr., L. G.
Published by
Pearson
ISBN 10:
0321768418
ISBN 13:
978-0-32176-841-4
Chapter 6 - Alkyl Halides: Nucleophilic Substitution and Elimination - Problems - Page 239: Problem 6-16 h
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