The increasing order of the reactivity of the following halides for the SN1 reaction is :

  

  • Option 1)

     (I) < (III) < (II)

  • Option 2)

    (II) < (III) < (I)

  • Option 3)

     (III) < (II) < (I)

  • Option 4)

     (II) < (I) < (III)

 

Answers (1)
A Aadil

As we learnt in

Nucleophilic Substitution Reaction -

SN1substitution nucleophilic unimolecular reaction.

These reactions proceed in two steps.

- wherein

 

 

Order of Nucleophilic Substitution Reaction -

Reactivity Order

3^{\circ}Alkyl\: Halide> 2^{\circ}Alkyl\: Halide> 1^{\circ}Alkyl \: Halide

- wherein

 

 SN_{1}  order reaction is judged by the stability of the substrate

Clearly  p-H_{3}CO-ph-CH^{\bigoplus }_{2} is most stable because of highest delocalization

Bt-CH^{\bigoplus }_{2} is third most stable due to lowest delocalization

\therefore II< I< III

 

 

 

 


Option 1)

 (I) < (III) < (II)

This is incorrect option

Option 2)

(II) < (III) < (I)

This is incorrect option

Option 3)

 (III) < (II) < (I)

This is incorrect option

Option 4)

 (II) < (I) < (III)

This is correct option

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