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The features of hydrocarbons are as follows
1). Length of the carbon skeleton may differ ( C-C, C-C-C, C-C-C-C-C, etc.). 
2). Branching of the carbon skeleton 
3). The number of double bonds may differ ( C=C-C-C, C=C=C-C ). 
4). The molecular structure may be in a ring form.
Its Simplest compound is Methane - CH4
2 3 2
This should be in Chemistry not in Physics!