Question

Which one of the following classes of compounds is obtained by polymerization of acetylene?
(A) Poly-yne
(B) Poly-ene
(C) Poly-ester
(D) Poly-amide

Answer 1

Polymers are divided into class, depending on the monomer used. This must be made by addition polymerization. We can identify the class of the polymer, by the last name of the monomer.

Complete step by step solution:
We can define the polymers as the compound that has a large number of molecules joined together. Some catalysts are added for the formation of polymers.
Polymers are divided into classes, depending on the monomer used. We can identify the class of the polymer, by the last name of the monomer.
If the polymer is formed by the monomer of an alkene (carbon having double bond) then the class of polymer is called poly-ene.
If the polymer is formed by the monomer of an alkyne (carbon having triple bond) then the class of polymer is called poly-yne.
If the polymer is formed by the monomer of any ester (between two alkyl groups $-COO-$ functional group is present) then the class of polymer is called poly-ester.
If the polymer is formed by the monomer of an amide (between two alkyl groups $-C(=O)N-$ group is present) then the class of polymer is called poly-amide.
Acetylene is the compound that belongs to the alkyne group and it is also known as ethyne having a formula $HC\equiv CH$. So the polymer formed from this compound will be poly-yne.

Therefore, the correct answer is an option (a)- Poly-yne.

Note: Polymers are formed by either addition polymerization or condensation polymerization. The basic difference is there is no loss of molecules in the addition polymerization but there is a loss of small molecules in the condensation polymerization.