Among cellulose, polyvinyl chloride, nylon and natural rubber, the polymer in which the following intermolecular force of attraction is weakest?

The word 'polymer' is coined from two Greek words : poly means many and mer means unit or part. The term polymer is defined as very large molecules having high molecular mass.Classification of polymers→On the basis of molecular forces→A large number of polymer applications in different fields depend on their unique chemical properties like tensile strength, elasticity, toughness, etc.These properties are governed by intermolecular forces. Eg - van der Waal forces and hydrogen bonds. Under this category, the polymers are classified into four subgroups→(1) Elastomers - In these polymer chains are held together by the weakest intermolecular forces. These weak binding forces permit the polymer to be stretched (2) Fibres - Fibres are the thread forming solids which possess high tensile strength and high modulus. In these polymers, there is strong intermolecular forces like H-bonds.Example→Nylon 6,6, terylene, etc (3) Thermoplastic polymers→These polymers possess intermolecular forces of attraction intermediate between elastomers and fibres.Example - Polyvinyl chloride, polythene, etc (4) Thermosetting polymers - These polymers are cross-linked or heavily branched molecules, which on heating undergo extensive cross-linking in moulds.Example→BakeliteHence, among nylon, polyvinyl chloride and cellulose and natural rubber; natural rubber is the polymer in which the intermolecular force in weakest.So, the correct option is (D).