Identify the monomer in the following polymeric structure :
`[-CH_(2) - CH = CH - CH_(2) - CH_(2) - overset(CN)overset(|)(CH)-]_(n)`
(i) On the basis of force between their molecules in a polymer to which class does neoprene belong ?
(ii) Can both addition and condensation polymerization result in the formation of a copolymer ?

Explanation

(i) The monomers are : `CH_(2) = CH - CH = CH_(2)` (Buta -1, 3-diene) and `CH_(2) = CHCN` (Acrylonitrile)
(ii) Neporene belongs to the class of elastomers since the intermolecular forces present in the monomer units (chloroprene) are quite weak. (iii) Yes, it is in possible. For answer, consult Q.15. (Additional Important Questions).