Final answer:
The molecule with a double bond is E. O₂, as it contains a double bond between the oxygen atoms. C₂H₂, while containing a triple bond, includes the characteristics of a double bond as well.
Step-by-step explanation:
The molecule with a double bond among the options given is C₂H₂, also known as ethyne or acetylene. This molecule, by definition, contains a triple bond between the two carbon atoms, but it conceptually encompasses the presence of a double bond since a double bond is a component of a triple bond. Therefore, identifying C₂H₂ answers the question correctly.
However, it is important to note that O₂ also has a double bond between the two oxygen atoms. Therefore, while C₂H₂ is correct in the context that a triple bond includes a double bond, the correct molecule with only a double bond is O₂, as indicated in the excerpt showing O=O represents a double bond.
The molecule with a double bond is C₂H₂. Explanation: Out of the options listed, the molecule with a double bond is C. C₂H₂, which is ethyne or acetylene. It has a triple bond between the two carbon atoms, which means it also has a double bond.