The general chemical formula for a hydrocarbon compound is C_nH_m, where:

* C represents carbon.

* H represents hydrogen.

* n and m are integers representing the number of carbon and hydrogen atoms, respectively.

The specific values of n and m determine the type of hydrocarbon. For example:

* Alkanes: Have the general formula C_nH_2n+2. They are saturated hydrocarbons with only single bonds.

* Alkenes: Have the general formula C_nH_2n. They are unsaturated hydrocarbons with at least one double bond.

* Alkynes: Have the general formula C_nH_2n-2. They are unsaturated hydrocarbons with at least one triple bond.

There are also cyclic hydrocarbons, which have a ring structure, and aromatic hydrocarbons, which have a special type of ring structure.