The IUPAC name of C2H2 is -
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The compound C2H2 is a hydrocarbon with a carbon-carbon triple bond. According to IUPAC nomenclature, compounds with triple bonds use the suffix "-yne". For two carbon atoms, the root name is "eth-", so the systematic IUPAC name is ethyne. Acetylene is a common name, but IUPAC prefers ethyne.
Final Answer: ethyne