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Answer: ketene
Answer	Crossword Clue
KETENE	Colorless, poisonous gas
KETENE	Gas obtained from acetone.
KETENE	Colorless gas.

KETENE	Odorous gas
ketene	a colorless poisonous gas C2H2O of penetrating odor used especially as an acetylating agent
ketene	colorless, poisonous gas, C2H2O, irritating to the lungs, prepared from acetone or acetic acid by pyrolysis: used chiefly in the manufacture of certain commercial chemicals, as acetic anhydride and aspirin
ketene	a toxic gas, also ETHONONE

Crossword

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Answer: ketene