Linear acetylenic carbon

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What Wikipedia says

Linear acetylenic carbon (LAC), also known as carbyne or a Linear Carbon Chain (LCC), is an allotrope of carbon that has the chemical structure (−C≡C−)n as a repeat unit, with alternating single and triple bonds. It would thus be the ultimate member of the polyyne family.

Excerpt from the Wikipedia article “Linear acetylenic carbon”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: A. La Torre, A. Botello-Mendez, W. Baaziz, J. -C. Charlier & F. Banhart, CC BY 4.0, via Wikimedia Commons.