\(CH_3NH_2\)
'C' must be an isocyanide, which is derived from a primary amine through the Carbylamine reaction \((CHCl_3+KOH)\). Additionally, the primary amine must be produced through the reduction of a nitro hydrocarbon. Therefore, 'A' is nitrobenzene.
So, the correct option is (B).
Amine is a type of compound which is derived from ammonia (NH3). According to Organic chemistry, they are basically classified as the functional groups of the organic nitrogen compounds that contain nitrogen atoms with a lone pair.
It is formed when one hydrogen atom in ammonia is substituted by an alkyl or aromatic group. Amino acids and methyl amine are the best examples that why aromatic amines include aniline.
Amines that have two organic substitutes either alkyl or aryl ones or both and are bound to the nitrogen together with one hydrogen are termed as secondary amines. For Example, Dimethylamine.
Tertiary Amines are the amines where the nitrogen consists of three organic substitutes. For example, Trimethylamine and EDTA.