The elimination of the energetic dangling bonds present at the edges of a tiny graphite sheet is supposed to be the driving force to induce curvature and closure in fullerenes; this phenomenon is also associated with the formation of larger systems, such as nanotubes and graphitic particles.

Which of the following have dangling bond?

Diamond have dangling bond.

Which of the following do not contain dangling bonds?

C60 is the purest allotropic form of carbon & it has a smooth structure without any dangling valency.