What is C5H5O2?

Answer 1

C5H5O2 is the Empirical Formula of Ferulic acid, a compound found in plants. However not to be confused with it's Molecular Formula which is C10H10O4

Answer 2

C5H5O2 is a chemical formula representing a compound with 5 carbon atoms, 5 hydrogen atoms, and 2 oxygen atoms. Without more specific information, it is difficult to determine the exact identity of this compound.

Answer 3

It's either 3-Deoxyglucosone OR Levoglucosan - depending on how the atoms are arranged n the molecule. BOTH substances have the same chemical formula C6H10O5

Answer 4

That is cellulose.