Question

Which is a characteristic of condensation polymerization?

Answer 1

Monomers are generally alkenes.
The reaction rarely produces a product.
Each monomer has more than one functional group.
The polymer contains all the atoms in the monomer units.

Answer 2

the molecule being lost is usually water (usually, but not always). During condensation reaction, two molecules combine to form a single molecule with the loss of some molecule (like i said before, usually water or some small molecule).