Which one of the following is not an allotrope of carbon?

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Which one of the following is not an allotrope of carbon?

Coal
Diamond
Graphite
Graphene
This question was previously asked in
UPSC CDS-2 – 2016
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Allotropes are different physical forms in which an element can exist in the same physical state. Diamond, Graphite, and Graphene are distinct structural forms of pure carbon.
Diamond, Graphite, and Graphene are well-known allotropes of carbon with different crystal structures and physical properties. For example, diamond is very hard with a tetrahedral structure, graphite is soft with a layered structure, and graphene is a single layer of carbon atoms in a hexagonal lattice.
Coal, however, is a naturally occurring fossil fuel composed primarily of carbon but also containing varying amounts of hydrogen, oxygen, nitrogen, sulfur, and other elements, as well as mineral matter. It is a complex mixture, not a pure element existing in a specific crystalline or amorphous form.
Other allotropes of carbon include fullerenes (like Buckyballs), carbon nanotubes, and amorphous carbon. Coal contains carbon but is chemically and structurally too complex to be considered an allotrope of carbon.

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