Question

which is an iupac name for a covalent compound? carbon dioxide carbon bioxide zinc monophosphate zinc phosphate

Explanation:

IUPAC naming for covalent compounds uses prefixes to indicate the number of atoms of each element. Carbon dioxide ($CO_2$) follows this naming convention where "di -" indicates two oxygen atoms. "Carbon bioxide" is an incorrect term. Zinc phosphate and zinc monophosphate are ionic compounds, not covalent.

Answer:

carbon dioxide