Question

the diagram shows the structure of glucose, a molecule that plants, algae and some bacteria make and use.
glucose
the structure of glucose illustrates which of the following properties of carbon?
carbon can form covalent bonds with up to 4 other elements.
carbon atoms can form ionic bonds only with oxygen.
carbon can form hydrogen bonds with only hydrogen.
carbon can form covalent bonds with up to 5 other elements.

Explanation:

Carbon has 4 valence electrons. It can form covalent bonds with up to 4 other elements (like hydrogen, oxygen, etc.). Hydrogen bonds are not formed by carbon in the context of its bonding to build molecules like glucose. Carbon forms covalent, not ionic bonds in organic molecules. And carbon can form covalent bonds with more than just oxygen.

Answer:

Carbon can form covalent bonds with up to 4 other elements.