Question

Which of the following will be the most stable diazonium salt $R{N_2}^ + {X^ - }$ ?
(A) $C{H_3}{N_2}^ + {X^ - }$
(B) ${C_6}{H_5}{N_2}^ + {X^ - }$
(C) $C{H_3}C{H_2}{N_2}^ + {X^ - }$
(D) ${C_6}{H_5}C{H_2}{N_2}^ + {X^ - }$

Answer 1

In order to answer the question, first we have to check whether the given salt is more stable than others. Then after we will discuss the most stable diazonium salts.

Complete answer: Among the given diazonium salts, benzene diazonium halide ${C_6}{H_5}{N_2}^ + {X^ - }$ is most stable due to conjugation of the N,N triple bond with benzene ring.
Aromatic diazonium salts such that Benzene Diazonium Halide are more stable than aliphatic diazonium salts due to dispersion of positive charge over the benzene ring caused by resonance. This is not found in aliphatic diazonium salts.
Diazonium salts are the organic compounds consisting of triple bonds in between Nitrogen atoms as well as having either an alkyl or aryl (benzene ring) on the other side. The diazonium salts are the moderate stage between the azo colors (or mixes are known to be mainstream shading specialists). Diazonium salt containing aryl bunch straightforwardly connected to the nitrogen iota is generally steady because of reverberation adjustment between the benzene core and N-molecule. And the Benzene Diazonium Halide has a N,N triple bond and containing aryl group directly linked to the Nitrogen atom makes it more stable than other given Diazonium Salts.

Note: One of the most widely recognized strategies for arrangement of diazonium salt is by the response of nitrous corrosive with fragrant amines. The response of aniline (sweet-smelling amine) with nitrous corrosive outcomes in the arrangement of the diazonium salt. This salt is the benzene diazonium chloride. Nitrous corrosive is a profoundly poisonous gas.