Increasing order towards nucleophilic substitution:
(i) 
(ii) 
(iii) 
(ii) 
(i)
(iii) 
(i)
(iii) 
(ii)
(ii) 
(iii)
Text Solution
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The nucleophilic substitution reaction is facilitated by the presence of electron withdrawing
group at ortho and para position. Hence, it enhances the rate of reaction.
Compound (iii) has three electron withdrawing groups at ortho and para positions w.r.t. chlorine while compound (ii) has only one electron withdrawing group and there is - no electron withdrawing group in compound (i). So, the increasing order of rate of reaction towards nucleophilic substitution is: (i) 
(ii) 
(iii).
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