Which of the following allotropes of carbon is a good conductor of electricity?

Correct option is C

Correct Answer: (C) Graphite

Explanation:
Graphite is a good conductor of electricity because it has delocalized electrons in its structure. These electrons can move freely between layers of carbon atoms, allowing electrical conductivity. Graphite consists of layers of carbon atoms arranged in a hexagonal pattern, and these layers can slide over each other easily.

Other Options:

• Charcoal: Charcoal is made of carbon, but it does not have the structure necessary to conduct electricity efficiently.
•  Fullerene: Fullerenes (such as C60) are a form of carbon, but they do not conduct electricity as well as graphite.
• Diamond: Diamond is a poor conductor of electricity because it has a very strong covalent bond structure, with no free electrons to conduct electricity.