Which one of the following is a molecule but not a compound?

Question

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A compound is a substance composed of two or more different types of atoms chemically bonded together, while a molecule is composed of two or more atoms held together by covalent bonds. O₂ is a molecule because it is composed of two oxygen atoms held together by a covalent bond, but it is not a compound because it is not composed of different types of atoms. H₂O and CH₄ are both compounds because they are composed of different types of atoms (hydrogen and oxygen in the case of H₂O, and carbon and hydrogen in the case of CH₄), while CO₂ is both a molecule and a compound because it is composed of different types of atoms (carbon and oxygen) held together by covalent bonds.

Which One of the Following Is a Molecule but Not