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Chapter 7: Problem 68

This section contains multiple choice questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONLY ONE is correct. The intermolecular forces of attraction are expected to be greatest in (a) linear chain polymers (b) branched chain polymers (c) cross linked polymers (d) elastomers.

Short Answer

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Answer: (c) Cross-linked polymers

Step by step solution

01

Definitions

To proceed with the solution, it is useful to first know the definitions of the different types of polymers mentioned in the options: - Linear chain polymers: These are polymers with a simple, linear structure, where monomer units are connected end to end. - Branched chain polymers: These polymers contain some branches along their linear chain. - Cross-linked polymers: These are polymers in which chains are connected through covalent bonds, forming a network structure. - Elastomers: These are polymers that can be stretched to at least twice their original length and return to their original shape when the stretching force is removed.
02

Identifying the factor affecting intermolecular forces

We need to identify which factor affects the intermolecular forces of attraction in these polymers. In this case, it is the structure of the polymer. More specifically, the presence or absence of cross-linking bonds between chains.
03

Comparing intermolecular forces in different types of polymers

Now, let's compare the intermolecular forces in each type of polymer based on their structures: - Linear chain and branched chain polymers have no cross-linking bonds and are held together by weaker van der Waals forces. - Elastomers also don't have cross-linking bonds and are characterized by their flexibility, which typically results from loose interactions between chains. - Cross-linked polymers, on the other hand, have covalent bonds connecting the chains, making them more rigid and stronger due to the direct bonding between chains.
04

Selecting the correct answer

From the comparison above, it is clear that cross-linked polymers have the greatest intermolecular forces of attraction due to the presence of covalent bonds between chains. Therefore, the correct answer is: (c) cross linked polymers

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