Question

The decreasing order of reactivity of the following compounds towards nucleophilic substitution (S_N2) is ______.

1. 
   
2. 
   
3. 
   
4. 
   

विकल्प

• (II) > (III) > (I) > (IV)

• (II) > (III) > (IV) > (I)

• (III) > (II) > (IV) > (I)

• (IV) > (II) > (III) > (I)

Answer 1

The decreasing order of reactivity of the following compounds towards nucleophilic substitution (S_N2) is (II) > (III) > (IV) > (I).

Explanation:

S_N2 reactions depend upon - I and - M effect on the substrate. On increasing - I and - M effect, rate of S_N2 reaction will increase.