The reactions of diazonium salts can be broadly divided into two
categories, namely (A) reactions involving displacement of nitrogen and
(B) reactions involving retention of diazo group A Reactions involving displacement of nitrogen
Diazonium group being a very good leaving group, is substituted
by other groups such as Cl
–, Br
–
, I
–
, CN
–
 and OH
– which displace
nitrogen from the aromatic ring The nitrogen  formed escapes from
the reaction mixture as a gas