Question

Which chloro derivative of benzene among the
following would undergo hydrolysis most
readily with aqueous sodium hydroxide to
furnish the corresponding hydroxy derivative?

Answer 1

Benzene doesn't undergo nucleophilic substitution reaction easily but as the number of  (electron-withdrawing group) group increases, benzene become electron-deficient and it undergo nucleophilic substitution. 

So -trinitrochlorobenzene reacts with  and perform nucleophilic substitution reaction.

Please Refer the attachment also

Answer 2

Answer:

Cl in 2, 4, 6-trinitrochlorobenzene is activated by three -NO2 groups at o and p-positions and hence undergoes hydrolysis most readily.

Thanks for the question...