Polymers are classified in a number of ways. On the basis of structures, they are divided into three types: linear polymers, branched chain polymers and cross linked polymers. Depending upon the nature of the repeating structural unit, polymers are classified as homopolymers and copolymers. Based on the magnitude of the intermolecular forces, they are classified into four types namely elastomers, fibres, thermoplastics and thermosetting plastics. Polymers are again classified as addition polymers and condensation polymers depending on the mode of polymerization. The different linear chains of terylene molecules are held together by (a) van der Waals forces (b) covalent bonds (c) hydrogen bonds (d) dipole-dipole interaction

Step by step solution

01

Understand the types of intermolecular forces

: (a) Van der Waals forces: These are weak intermolecular forces resulting from transient induced dipoles or temporary attractive forces between molecules. (b) Covalent bonds: These are strong bonds formed between atoms by sharing of electrons between the atoms. (c) Hydrogen bonds: These are relatively strong intermolecular forces that occur between a highly electronegative atom (like oxygen, nitrogen, or fluorine) and a hydrogen atom bonded to another electronegative atom. (d) Dipole-dipole interaction: These are attractive forces that occur between molecules with permanent dipoles, where the positive end of one molecule is attracted to the negative end of another molecule.

02

Know the structure of terylene molecules.

: Terylene, also known as polyethylene terephthalate (PET), is a polymer made up of ester monomers, containing benzene rings and ester groups. Its main chain is formed by ester linkages between the monomers. The terylene molecules have a linear structure.

03

Determine the forces holding terylene molecules together.

: Considering the structure of terylene, it has polar bonds (the C=O bonds in ester groups), which cause it to have a permanent dipole moment. The molecules are held together by the interaction between these dipoles, which can be classified as dipole-dipole interaction. Hence, the correct answer is: (d) dipole-dipole interaction

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