Question

Aniline when treated with $NaN{O_2}$ and HCl at $0 - {5^ \circ }C$ gives as a product.
A.Chloroaniline
B.Benzene diazonium chloride
C.Chlorobenzene
D.Dichlorobenzene

Answer 1

Hint: Aniline is an organic compound with the formula ${C_6}{H_5}N{O_2}$ . It is the simplest aromatic amine which consists of a phenyl group that is attached to an amino group. Moreover, it is considered as an electron rich benzene derivative and it reacts rapidly in electrophilic aromatic substitution reactions.

Complete step by step answer:
Aniline is an organic compound that has been cheaply available for many years. They have the general formula ${C_6}{H_5}N{H_2}$ with the phenyl group attached to the amino group. It is generally in the form of yellowish and somewhat brownish oily liquid that has a musty and fishy odor. It smells like the odor of rotten fish. Now, let’s discuss some of the properties of this compound.
1.It has a boiling point of about ${184^ \circ }C$ and melting point of about $ - {6^ \circ }C$ .
2.It is said to be weak base and on its reaction with strong acids, it forms anilinium ion
3.It is slightly soluble in water and sometimes freely soluble in chemicals such as alcohol and ether.
Moreover, it reacts with sodium nitrite and HCl in cold conditions to form benzene diazonium chloride. The reaction is as shown:
 ${C_6}{H_5}N{H_2}\xrightarrow[{NaN{O_2}}]{{HCl}}[{C_6}{H_5} - {N_2}^ + C{l^ - }]$

Hence, option B is correct.

Note: Anilines are used in the rubber industry for the processing of rubber chemicals and products such as gloves, balloons, etc. Moreover, it is employed in the production of drugs such as paracetamol, in the manufacture of jeans, in the agriculture industry as pesticides and fungicides and many more. It also undergoes reactions such as oxidation and acylation.