A) (III) < (II) < (I)
B) (II) < (I) < (III)
C) < (III) < (II)
D) (II) < (III) < (I)
Correct Answer: B
Solution :
For any \[{{\text{S}}_{\text{N}}}\text{1}\]reaction reactivity is decided by ease of dissociation of alkyl halide \[R-X{{R}^{\oplus }}+{{X}^{\oplus }}\] Higher the stability of \[{{R}^{\oplus }}\](carbocation) higher would be reactivity of \[{{\text{S}}_{\text{N}}}\text{1}\]reaction. Since stability of cation follows order. \[C{{H}_{3}}-C{{H}_{2}}-\underset{\oplus }{\overset{\oplus }{\mathop{C}}}\,{{H}_{2}}\] \[<C{{H}_{3}}-\overset{\oplus }{\mathop{C}}\,H-C{{H}_{2}}-C{{H}_{3}}\] \[<p-{{H}_{3}}CO-{{C}_{6}}{{H}_{4}}-\overset{\oplus }{\mathop{C}}\,{{H}_{2}}\] Hence correct order is \[\]You need to login to perform this action.
You will be redirected in
3 sec