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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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The correct order ofrate of S_(N^1) is : is :

Arrange the following three chlorides in decreasing order towards S_(N^1) reactivity.

Knowledge Check

  • The correct order of reactivity PhMgBr with

    A
    `I gt II gt III`
    B
    `III gt II gt I`
    C
    `II gt III gt I`
    D
    `I gt III gt I`

  • The correct order of reactivity is :

    A
    `CH_(3)COClgtCH_(3)COOC_(2)H_(5)gtCH_(3)CONH_(2)`
    B
    `CH_(3)COOC_(2)H_(5)gtCH_(3)COClgtCH_(3)CONH_(2)`
    C
    `CH_(3)CONH_(2)gtCH_(3)COClgtCH_(3)COOC_(2)H_(5)`
    D
    `CH_(3)COClgtCH_(3)CONH_(2)gtCH_(3)COOC_(2)H_(5)`.

  • Which of the following is the correct order of decreasing S_(N^2) reactivity?

    A
    `RCH_2X gt R_2CHX gt R_3CX`
    B
    `R_3CX gt R_2CHX gt RCH_2X`
    C
    `R_2CHX gt R_3CX gt RCH_2X`
    D
    `RCH_2X gt R_3CX gt R_2CHX`
    (X=a halogen)

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    Which of the following is the correct order of decreasing reactivity nucleophilic substitution?

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