Aniline, with the chemical formula C6H5NH2, is an organic compound classified as a primary aromatic amine. It consists of a benzene ring directly bonded to an amino group (-NH2) and is the simplest aromatic amine.

Here's a breakdown of the composition of aniline:

Carbon (C): Aniline contains six carbon atoms. These carbon atoms form the benzene ring structure and are also found in the amino group.

Hydrogen (H): There are seven hydrogen atoms in aniline. Five of these hydrogen atoms are bonded to the carbon atoms in the benzene ring, while the remaining two are attached to the nitrogen atom in the amino group.

Nitrogen (N): Aniline contains one nitrogen atom. This nitrogen atom is part of the amino group (-NH2) and is bonded to two hydrogen atoms.

In summary, aniline is composed of six carbon atoms, seven hydrogen atoms, and one nitrogen atom. The amino group (-NH2) is directly attached to the benzene ring, giving aniline its characteristic properties and reactivity as a primary aromatic amine.