Which one of the following is the purest form of Carbon ?

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Which one of the following is the purest form of Carbon ?

Charcoal
Coke
Fullerene
Carbon black
This question was previously asked in
UPSC NDA-1 – 2018
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Among the given options, Fullerene is considered one of the purest forms of carbon because it consists of distinct molecules made solely of carbon atoms, which can be isolated and purified.
Charcoal, coke, and carbon black are amorphous or paracrystalline forms of carbon often produced by incomplete combustion or carbonization of organic matter. They typically contain impurities and consist of irregular aggregates of carbon structures. Fullerenes, like C₆₀, are molecular allotropes with cage-like structures composed only of carbon atoms, and they can be synthesized and purified to a high degree.
Other very pure forms of carbon include diamond (a crystalline allotrope) and carbon nanotubes and graphene (which can be produced with very high purity). Among the options listed, Fullerene best fits the description of a pure form.

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