What term describes four carbon atoms?

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

Answer: (D)

Counting how many atoms are involved and using the right numerical prefix is the key idea here. When there are four carbon atoms, the prefix that means four is tetra-, so the term becomes tetracarbon. This fits four carbons exactly, using the standard naming pattern where mono- is one, di- is two, tri- is three, and tetra- is four. The other options would only describe one, two, or three carbons, not four, so they don’t match the situation described.