Answer
$PH_3$ acts as a better nucleophile
Work Step by Step
In $PH_3$ and $NH_3$, $P$ is larger than $N$, so it is more polarizable. Hence, $PH_3$ acts as 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 c
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