Final answer:
The compounds listed belong to different categories in chemistry, including elemental molecules, alkane series, nitrogen-hydrogen compounds, and carbohydrates.
Step-by-step explanation:
The compounds H₂, CH₄, C₆H₁₂O₆, NH₃, Cl₂ all represent different categories of substances in chemistry. H₂ (hydrogen gas) and Cl₂ (chlorine gas) are diatomic molecules made up of two atoms of the same element and are examples of elemental molecules. CH₄ (methane) is a simple hydrocarbon and belongs to the alkane series, which is a homologous series of compounds. NH₃ (ammonia) is an example of a nitrogen-hydrogen compound. Finally, C₆H₁₂O₆ (glucose) is a complex organic molecule known as a carbohydrate.