Consider the following speciesI)  II)III)IV) Incorrect statement is

Hint: Group which contains atleast one electronegative atom like F, Cl, O N etc., are acting as –IE groups and exhibits –I effect.→ In a molecule when both mesomeric and inductive effevts simultaneously operating then mesomeric effect is predominant than inductive effect.∴"OH" group in phenol mainly acts as electron donating group by +ME and hence it increases the electron density in benzene ring.NH3 group shows only –I effect but donot exhibits –M effect [due to lack of lonepair on "N"] and decreases the electron density in benzene ring.∴attack of electrophile on benzene ring of anilinium ion decreases.i.e., NH3 deactivates the benzene ring by –I effect towards electrophile.