Question

which compound are in hydrocarbon??

Answer 1

the compound present in hydrocarbon are hydrogen and carbon.

Answer 2

Hydrocarbons, as the name suggests, are made up of Hydrogen and Carbon. 
These hydrocarbon derivatives are organic compounds and combust in presence of O₂, producing CO₂, H₂O, heat and light.
Hydrocarbons are present all around you.
The pencil you use? It is hydrocarbon
The oil in your food? It is a saturated hydrocarbon
The gas in your car? Petrol and Diesel are also hydrocarbons.