The decreasing order of the reaction rate with nucleophile 
is
(I) 
(II) 
(III) 
(IV) 
III 
I 
II
III 
II 
I 
II 
III 
IV
IV 
II 
I
Text Solution
Verified by ExpertsA
Above reaction is known as nucleophilic substitution reaction. Bimolecular nucleophilic substitution reaction follows second-order kinetics. The rate of reaction depends on the concentration of two firstorder reactants.
Hydroxide ion 
is stronger nucleophilie than acetate ion as in acetate ion, the negative charge is involved in resonance with carboxylic group.
Methoxide ion 
is more nucleophilic than hydroxide ion 
due to 
effect of methyl group. 
is very weak nucleophile because the negative charge is in resonance with ring and charge further decreases the order is
(iv) (iii) (i) (ii)
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