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What is "ethynol"

Wiktionary
ethynol

n. (context organic compound English) The acetylenic alcohol of formula HC≡C-OH

Wikipedia
Ethynol

Ethynol is an alcohol ( ynol) with the formula CHO. It is the much less stable tautomer of ethenone.

At low temperature in a solid argon matrix it is possible to isomerize ethenone to form ethynol.