What is the IUPAC name of 'Acetylene' ?
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The IUPAC name of acetylene is ethyne.
Acetylene’s IUPAC name is ethyne.
Here’s the simple logic behind it:
“Eth-” tells you there are two carbon atoms.
“-yne” tells you there’s a triple bond between them.
Acetylene has the formula C₂H₂ and contains a carbon–carbon triple bond. So when you apply standard IUPAC naming rules, the correct systematic name becomes ethyne.
“Acetylene” is just the older common name that’s still widely used, especially in industry.