The question involves identifying a reagent that reacts with a given compound to form an orange-red dye. The reaction shown in the image is a typical diazo coupling reaction, which involves an aromatic amine.
The specific reaction here suggests the use of aniline or a derivative suitable for diazo coupling.
In diazo coupling reactions, an aniline derivative reacts with a diazonium salt to form colored azo dyes. The presence of NaOH in the reaction indicates that the compound has to be an aromatic amine that forms diazonium salts under basic conditions.
Option A is correct as it depicts aniline (\(C_6H_5NH_2\)), which is commonly used in diazo coupling reactions to form azo dyes. The diazonium ion (\(C_6H_5N_2^+\)) reacts with the nitrogen of aniline to form the azo compound responsible for the orange-red dye.
Conclusion: Thus, reagent 'A' is aniline, which undergoes diazo coupling to produce the indicated product.
The primary and secondary amines, including several amine derivatives, have a direct impact on their properties due to the presence of hydrogen bonding. The compounds containing phosphorus have a lower boiling point and the compounds containing amines and alcohol have a higher boiling point. The structure of alkanols is immensely similar to that of amine except the presence of the hydroxyl group. In such a case, oxygen has a higher electronegativity than that of nitrogen, so alkanol compounds are more acidic in nature in comparison to the amines.
On account of the ability to form hydrogen bonds, the amines have tendencies of high solubility in water. The amine molecules such as Ethyl, diethyl, triethyl, and Methyl are gaseous in nature. Whereas, higher weight amines have a solid structure and alkyl amines have a liquid structure. There is an ammonia smell to gaseous amines and a fishy smell to liquid amines. The solubility of amines entirely depends upon the number of carbon atoms in the molecule.
