All molecules are not compounds. Option C.
What are compounds?
A compound is a substance made from two or more atoms of different elements that are linked together by bonds. The bond could be an ionic, covalent, metallic, or hydrogen bond.
A molecule, on the other hand, is a group of atoms, the same or different, chemically bonded together and represents the smallest fundamental unit that can participate in chemical reactions.
Going by these two definitions, one can conclude that while all compounds are molecules, not all molecules are compounds. If the group of atoms that bond together is chemically identical, a molecule is formed but not a compound.
More on compounds can be found here: https://brainly.com/question/13516179
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