There isn't a single, universally accepted chemical name for coal. This is because coal is a complex mixture of various organic compounds, primarily hydrocarbons, along with trace amounts of other elements like sulfur, nitrogen, and oxygen.

Here's why it's difficult to assign a specific chemical name:

* Variable Composition: Coal's composition varies depending on its origin, geological age, and the type of plant matter it formed from.

* Complex Structure: The hydrocarbons within coal are not simply individual molecules, but rather a complex network of interconnected chains and rings.

* Varying Ratios: The proportions of different elements and compounds in coal change significantly, making a single chemical formula impossible.

Instead of a single name, coal is classified based on its rank, which refers to its degree of coalification (the process of transformation from plant matter to coal). The ranks, in order of increasing coalification, are:

* Peat: The least coalified form.

* Lignite: A brown, soft coal.

* Sub-bituminous coal: A black, softer coal.

* Bituminous coal: A hard, black coal.

* Anthracite: The most coalified form, hard and shiny.

Therefore, you wouldn't find a specific chemical name for coal but rather a broad description based on its rank and the specific properties of the coal sample.