C2H2

C2H2 may mean:

The molecular formula C₂H₂ (molar mass: 26.04 g/mol, exact mass: 26.01565 u) may refer to:

• Acetylene (or ethyne)
• Methylidenecarbene
• Vinylidene group

• C2H2 zinc finger, short for Cys₂His₂ a class of transcription factors with the small protein structural motif stabilised with Zinc ions