Question

what is allotrope of carbon.why carbon has most allotropic forms

Answer 1

Carbon is capable of forming many allotropes due to its valency. Well-known forms of carbon include diamond and graphite. In recent decades many more allotropes and forms of carbon have been discovered and researched including ball shapes such as buckminsterfullerene and sheets such as graphene

Answer 2

those compounds which have same chemical properties but different physical properties called allotropes of carbon .for ex diamond,graphite ,Florence.
carbon has most catenation power so it has most allotropic forms