Which of the following reactions belong to electrophilic aromatic substitution?
(i) Bromination of acetanilide
(ii) Coupling reaction of aryldiazonium salts
(iii) Diazotisation of aniline
(iv) Acylation of aniline
Which of the following reactions belong to electrophilic aromatic substitution?
(i) Bromination of acetanilide
(ii) Coupling reaction of aryldiazonium salts
(iii) Diazotisation of aniline
(iv) Acylation of aniline

Solution:

Option (i) and (ii) are the answers.

Reason:

When benzene diazonium chloride reacts with phenol, the para-position of the phenol molecule is coupled with the diazonium salt, forming phydroxy azobenzene. 
coupling reaction is the name for this type of reaction. 
This is an electrophilic substitution reaction in action. 
The following is an illustration of the reaction: