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Consider the following bromides : T...

Consider the following bromides :

The correct ordder of `S_(N)1` reactivity is :

A

`IIIgtIIgtI`

B

`IgtIIgtIII`

C

`IIgtIIIgtI`

D

`IIgtIgtIII`

Text Solution

Verified by Experts

The correct Answer is:
C
Formation of carbocation is the rate determining step in `S_(N)1` reaction. Therefore, the alkyl halide which gives more stable carbocation is more reactive towards `S_(N)1` reaction.

It involves `1^(@)` Carbocation Allyl Carbocation `2^(@)` Carbocation
Stable the carbocation faster is the reaction.
Order of stability of carbocation is : Allyl `gt3^(@)gt2^(@)gt1^(@)`
`therefore` Order of reactivity is (II) `gt` (III) `gt` (I).
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