The following formula represent the section of polymer, A. Suggest the structures of the monomers from which it is formed.

The given structure is Nylon-6,6 polymer formed by the step growth polymerization of dibasic acids and diamines or their equivalents to form a polyamide. The dibasic acid used in Nylon-6,6 is adipic acid or hexanedioic acid ( CH 2 ) 4 ( COOH ) 2 , a dicarboxylic acid and the diamine used is hexamethylene diamine H 2 N ( CH 2 ) 6 NH 2 in a ratio of 1 : 1 to form the polymer, - CO - CH 2 4 - CO - NH - CH 2 6 - NH - n . Structures of momomer are given below :

Arrange the following polymers in the increasing order of their intermolecular forces : Nylon- 6 , neoprene, polyvinyl chloride.

Neoprene is synthetic rubber having weak intermolecular forces hence categorised in elastomers. Nylon- 6 is a fibre having dipole-dipole interactions and polyvinyl chloride is a thermoplastic whose intermolecular forces of attraction are in between those of elastomers and fibres. Thus, increasing order of intermolecular forces : Neoprene < polyvinyl chloride < nylon- 6 .