Question

Which amongst the following is not an allotrope of carbon?

• A. Carbon dioxide
• B. Fullerene
• C. Diamond
• D. Graphite

Answer 1

The correct option is A Carbon dioxide

Allotropes are the different forms in which an element can exist. For example, diamond, graphite and fullerene are allotropes of carbon.

However, carbon dioxide $\left(C{O}_2\right)$ is not an allotrope of carbon but instead a compound of carbon.
It contains oxygen atoms bonded to the carbon atom.