what is allotropy?what is its properties?
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Linear acetylenic carbon (LAC), also called carbyne, is an allotrope of carbon that has the chemical structure (−C≡C−)n as a repeating chain, with alternating single and triple bonds.[1][2] It would thus be the ultimate member of the polyyne family.

Electron micrograph of a linear carbon chain (carbyne) between a carbon lump and Fe electrode.[3]
This type of carbyne is of considerable interest to nanotechnology as its Young's modulus is 32.7 TPa – forty times that of diamond.[4] It has also been identified in interstellar space; however, its existence in condensed phases has been contested recently, as such chains would crosslink exothermically (and perhaps explosively) if they approached each other.[5]

Electron micrograph of a linear carbon chain (carbyne) between a carbon lump and Fe electrode.[3]
This type of carbyne is of considerable interest to nanotechnology as its Young's modulus is 32.7 TPa – forty times that of diamond.[4] It has also been identified in interstellar space; however, its existence in condensed phases has been contested recently, as such chains would crosslink exothermically (and perhaps explosively) if they approached each other.[5]
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Answer:
polymorphism occurring in elements is called allotropy.
e.g:- diamond, graphite and fullerene are allotropic form of carbon.
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