Sorting is a method that could separate those materials
Answer:
Alkyne
Explanation:
The homologous series for this compound is the Alkyne because of the presence of the triple bond present between the third and fourth carbon atoms as seen in the picture attached.
They have a mass for the particles
There are no totally elastic collisions
There are intermolecular forces
Lithium has 1 valence electron available for bonding. So its A.