Final answer:
C₆₀ (fullerenes) is the molecular allotrope of carbon among the options provided; diamond and graphite are giant structures rather than molecular ones.Answer is option (c).
Step-by-step explanation:
Among the listed allotropes of carbon, C₆₀ (fullerenes) is the one that is molecular. Allotropes like diamond and graphite consist of a giant 3D network of covalently bonded carbon atoms, making them not molecular but rather extended structures.
In contrast, C₆₀, also known as buckminsterfullerene or simply fullerenes, is a molecular form of carbon composed of sixty carbon atoms arranged in a spherical structure. The carbon atoms in fullerenes are bonded together in a pattern that resembles a soccer ball, with a mix of hexagon and pentagon faces.