Hydrocarbons come in many different structures. They can vary in length, be branched or unbranched, form linear or ring shapes (or a combination), and include various combinations of single, double, and triple carbon-carbon bonds. Even if two hydrocarbons have the same chemical formula, their atoms can be linked or arranged in space in different ways, making them isomers of each other (and sometimes giving them very different properties). All of these types of structural differences affect the three-dimensional shape or conformation of the hydrocarbon molecule.
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