Allotropy is a property shown by which class substances

Allotropy is a property shown by which class substances: elements, compounds
or mixtures ? Explain allotropy with suitable examples.

The various physical forms in which an element can exist are called allotropes of the element.
Ex : Carbon exist in 3 forms of allotropes.

  1. Diamond
  2. Graphite
  3. Buckminster fullerene.