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  4. Which of the following halides will be most reactive in SN1 reaction and SN2 reactions, respectively <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/c-b3erl2e9qt45.png />

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Q. Which of the following halides will be most reactive in $S_{N}1$ reaction and $S_{N}2$ reactions, respectively

Question

NTA AbhyasNTA Abhyas 2020Haloalkanes and Haloarenes

Solution:

(I) $1^\circ $ allylic halide have less steric hindrance, so it is more reactive for $S_{N}2$ reaction.

(III) $3^\circ $ allylic halide gives most stable tertiary allylic carbonium ion so most reactive towards $SN^{1}$ reaction.