 
       
      
    The correct order of the following compounds showing increasing tendency towards nucleophilic substitution reaction is :   
Option: 1 (iv) < (i) < (ii) < (iii)
Option: 2 (i) < (ii) < (iii) < (iv)
Option: 3 (iv) < (i) < (iii) < (ii)
Option: 4 (iv) < (iii) < (ii) < (i)
 
                
                  
Reactivity  -M group present at O/P position.
As the number of -M group increases the reactivity towards nucleophilic substitution reaction increases.
Correct order: (i) < (ii) < (iii) < (iv)
Therefore, the correct answer is Option (2).
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