Question

The diazonium salts are the reaction product in presence of excess of mineral acid with nitrous acid and
(A) Primary aliphatic amine
(B) Secondary aromatic amine
(C) Primary aromatic amine
(D) Tertiary aliphatic amine

Answer 1

Hint: Diazotization is the process of creating diazonium salts or compounds. Peter Griess gave it for the first time. As a result, the method utilised to create diazonium salts from aromatic amines is called diazotization. They are formed by reaction of mineral acid with nitrous acid and primary aromatic amine.

Complete Step by Step Solution:
Standard reagents used in the synthesis of organic molecules, particularly aryl derivatives, include diazonium compounds. But the initial application for diazonium salts was to create colourful fabrics that were water-fast by soaking them in an aqueous solution of the diazonium compound, then dipping them in a solution of the electron-rich ring that underwent electrophilic substitution. Secondary amines and tertiary amines never form diazonium salts, so option B. and C. cannot be the answer.

Now if we take a primary aliphatic amine and make it react with nitrous acid in presence of hydrochloric acid, diazonium salt is obtained which is unstable at low temperature. As a result \[{N_2}\] will leave leading to the formation of carbocation.
Now we take an example of primary aromatic amine like aniline. When it reacts with nitrous acid in presence of hydrochloric acid it forms diazonium salt. The diazonium salt produced is stable at high temperatures too.
Hence, option C. is the answer.

Note: Compounds made of diazonium are particularly beneficial to the dye and pigment industries. They were initially employed in the creation of fabrics with water-fast dyes. Compounds made of diazonium are particularly beneficial to the dye and pigment industries. They were initially employed in the creation of fabrics with water-fast dyes. The field of nanotechnology may benefit from the use of diazonium salts. They help single-wall nanotubes to be functionalized effectively.