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  4. The decreasing order of SN2 reaction for the given compounds is

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Q. The decreasing order of SN2 reaction for the given compounds isChemistry Question Image

AIIMSAIIMS 2018Haloalkanes and Haloarenes

Solution:

Rate of SN2 reaction $\propto$ -I-effect, - M-effect
$\quad\quad\quad\quad\quad\quad\quad\propto\frac{1}{steric \,crowding}$
$I.\quad CH_{3} - CH_{2} - CH_{2} - Cl$
$II.\quad Ph - CH_{2} - CH_{2} - Cl$
Thus, rate of SN2 reaction is II > I > III > IV.

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