Phenyl Isocyanide Test to Identify Aromatic Primary Amines

The Phenyl Isocyanide Test is a chemical test used to identify the presence of aromatic primary amines. It is based on the reaction of primary aromatic amines with phenyl isocyanide to form a yellow or brown colored complex.

Reaction Mechanism
When a primary aromatic amine is added to phenyl isocyanide, it undergoes a nucleophilic substitution reaction in which the amine group attacks the carbon atom of the isocyanide group. The nitrogen atom of the amine then forms a bond with the carbon atom, and the isocyanide group is converted to an amide group.

The resulting complex is yellow or brown in color and is easily visible. The intensity of the color is directly proportional to the amount of primary aromatic amine present in the sample.

Other Applications
The Phenyl Isocyanide Test is specific to primary aromatic amines and does not react with secondary or tertiary aromatic amines or quaternary ammonium compounds. This test is commonly used in organic chemistry to identify and determine the purity of primary aromatic amines.

In addition to its use in organic chemistry, the Phenyl Isocyanide Test is also used in the pharmaceutical industry to detect impurities in drugs and to determine the concentration of primary aromatic amines in drug formulations.

Conclusion
In conclusion, the Phenyl Isocyanide Test is a simple and effective chemical test used to identify the presence of primary aromatic amines. It is specific to this type of amine and does not react with other types of amines or quaternary ammonium compounds. This test finds its application in organic chemistry and the pharmaceutical industry.

As it is carbylamine reaction in which the primary amine is get converted ibto isocyanide hence the correct option is A.