C2H2
# C2H2

C2H2 may mean:

## Molecular formulae

The molecular formula $C_2H_2$ (molar mass: 26.04 g/mol, exact mass: 26.01565 u) may refer to:

* Acetylene (or ethyne)
* Methylidenecarbene
* Vinylidene group

## Transcription factors

* C2H2 zinc finger, short for $Cys_2His_2$ a class of transcription factors with the small protein structural motif stabilised with Zinc ions
