Comparartive Details Of E2 And SN2 Reactions

Alkyl and Aryl Halides of Class 12

Factor

 

Favors E2

 

Favors SN2

 

(1) Alkyl group

 

3° > 2° > 1°

 

1° > 2° > 3°

 

(2) Leaving group

 

I− > Br− > Cl− > F−

 

I− > Br− > Cl− > F−

 

(3) Reagent

 

Strong, bulky Bronsted base

 

Strong nucleophile

 

(4) Solvent

 

(i) Low polarity

 

(ii) Protic Polar

 

(iii) Aprotic polar

 


Favored

 

Disfavored

 

Strongly favored

 


Slightly favored

 

Disfavored

 

Favored

 

 

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