Which of the following halides will be most reactive in SN1 reaction and SN2 reactions, respectively

Question

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" /> (A) (I), (II) (B) (II), (I) (C) (I), (III) (D) (III), (I)

Tardigrade Admin · Accepted Answer

(I) 1° allylic halide have less steric hindrance, so it is more reactive for SN2 reaction. (III) 3° allylic halide gives most stable tertiary allylic carbonium ion so most reactive towards SN1 reaction.

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

(I), (II)

(II), (I)

(I), (III)

(III), (I)

(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 $S N^{1}$ reaction.

Q. Which of the following halides will be most reactive in SN​1 reaction and SN​2 reactions, respectively