Question

The correct statement(s) related to allotropes of carbon is/are

• A. Graphite is the most stable allotropes of carbon and having a two dimensional sheet like structure of hexagonal rings of carbon
• B. Diamond is the hardest allotrope of carbon and having a three dimensional network structure of carbon
• C. Fullerene $\left(C_{60}\right)$ is recently discovered non-crysralline allotrope of carbon having a football-like structure
• D. Vander Waal's force of attraction acts between the layer of graphite

Answer 1

Answer: (A), (B), (D)

Vander Waal's force of attraction acts between the layer of graphite

Structure of graphite and diamond are shown in figure.
(a) Due to the delocalized electrons present in the layered structure graphite, the thermal stability of graphite is highest.

(b) In diamond each carbon atom is bonded covalently to 4 other carbon atoms in tetrahedral fashion. So a lot of carbon atoms are bonded to each other giving a very rigid structure. Since it is covalently bonded to each other and structure is very rigid thus diamond is the hardest allotrope of carbon.

(c) Fullerenes are also crystalline. Fullerene $C_{60}$ molecule has a shape like soccer ball and called Buckminster fullerence.

(d) van der Waal's force of attraction acts between the layers of graphiite.
Diamond Graphite