C6H4(G)(Cl) + aq. KOH --> C6H4(G)(OH)
for which of the following G, above reaction will be the fastest ?
a) -OH
b) -CH3
c) -NO2
d) -CHO
​please explain


Dear Student,

The presence of electron withdrawing group enhances the nucleophilic substitution reaction of substituted chlorobenzene. Therefore, (a) and (b) will decrease the rate of substitution.
NO2 and CHO will increase the rate of substitution. However, NO2 is more deactvating group therefore, rate of substution will be fastest when G= NO2
Hence, correct answer is (c)

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