What term describes a molecule containing four carbon atoms?

• A. tetracarbon
• B. monocarbon
• C. dicarbon
• D. tricarbon

Answer: (A)

When we talk about how many carbon atoms are in a molecule, we use prefixes that describe the count. For four carbon atoms, the combining form is tetra- and the term that describes the carbon count is tetracarbon. So a molecule with four carbons is described as tetracarbon.

This matches the idea that the other terms describe fewer carbons: monocarbon means one carbon, dicarbon means two, and tricarbon means three. Keep in mind that tetracarbon focuses on the number of carbon atoms, while there are also common compound names for specific four-carbon structures (like butane) that refer to the arrangement of atoms, not just the count.