Question

Which of the following are allotropes of carbon?

1. Carbon dioxide 2. Diamond 3. Carbon monoxide 4. Graphite

• A. All four are allotropes of carbon.
• B. Only 2 and 4 are allotropes of carbon.
• C. Only 1 and 2 are allotropes of carbon.
• D. Only 1 and 3 are allotropes of carbon.

Answer 1

The correct option is B

Only 2 and 4 are allotropes of carbon.

The allotrope is the property of some chemical elements to exist in two or more different forms, in the same physical state. The allotropes of carbon among the above are diamond and graphite. Carbon monoxide and carbon dioxide are not pure carbon compounds. They are the combination of carbon and oxygen. The allotropes must be the pure form of carbon.