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Q.
KI in acetone, undergoes $S_{N}2$ reaction with each of P, Q, R and S. The rates of the reaction vary as
NTA AbhyasNTA Abhyas 2022
Solution:
$S_{N}2$ reactions are through back side attack of attacking $Nu^{-}$ and not on the basis of stability of carbocation. Here less hindered site is more favourable for attack hence the correct order is
