Which of the following is not an allotrope of carbon?
Correct Answer : a ) CoalExplanation :
Carbon is a non-metallic element and occurs in various forms in nature with different physical properties; these forms of carbon are called allotrope of carbon. Diamond, Graphite and Graphene are the allotropes of carbon. Carbon also exists in amorphous forms of graphite- charcoal, coke and carbon black. Graphene is the thinnest material known to man and is many times stronger than steel.
Carbon is present in coal but coal is not an allotrope of carbon.
Hence, option (a) is correct.
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