Astudent writes the following explanation of how one type of compound is formed. these compounds are made by the repeated joining of one smaller unit to the end of a growing chain. the units are generally alkenes, which retain all their atoms in the chain. a compound which undergoes a similar process is polyethylene.
which process is being described?
condensation polymerization
addition polymerization
dehydrohalogenation
dehydrogenation

addition polymerization

Explanation:

Addition polymerization : A chemical reaction in which small units called as monomers are joined to form a bigger molecule called as polymer.

Condensation polymerization : A chemical reaction in which small units called as monomers are joined to form a bigger molecule called as polymer and small by products are also formed along with the polymer.

Dehydrohalogenation: A chemical reaction in which hydrogen and halogen are removed from alkyl halides using alcoholic KOH resulting in the formation of alkenes.

Dehydrogenation : A chemical reaction in which hydrogens are removed from hydrocarbons using oxidizing agents resulting in the formation of alkenes or alkynes.

the dissolution of polymer can be thermodynamically described in 2 steps.