Identify the incorrect statement

A. Bakelite and urea-formaldehyde resins are elastomers.

B. Polyamides like nylon 6,6 are examples of fibers.

C. Polystyrene, polyvinylchloride, and polythene are thermoplastic polymers.

D. Thermoplastic polymers have intermolecular forces between elastomers and fibers.

Choose the most appropriate answer from the options given below:

A only

The answer is (3) A only.

Let's break down each statement and discuss why option A is the incorrect statement:

A. Bakelite and urea-formaldehyde resins are elastomers.

This statement is incorrect. Bakelite and urea-formaldehyde resins are not elastomers; they are thermosetting polymers. Elastomers are a type of polymer that exhibits elastic behavior, meaning they can return to their original shape after being stretched or deformed. Bakelite and urea-formaldehyde resins, on the other hand, are thermosetting polymers, which undergo a chemical cross-linking process during curing and become rigid and infusible. Once set, they cannot be melted or reprocessed like thermoplastic polymers.

Now let's evaluate the other statements:

B. Polyamides like nylon 6,6 are examples of fibers.

This statement is correct. Polyamides, such as nylon 6,6, are indeed examples of synthetic fibers. Nylon is widely used in the production of textiles and other materials due to its strength and durability.

C. Polystyrene, polyvinyl chloride, and polythene are thermoplastic polymers.

This statement is correct. Polystyrene, polyvinyl chloride (PVC), and polyethylene (polythene) are all examples of thermoplastic polymers. Thermoplastic polymers can be melted and reprocessed multiple times without undergoing significant chemical changes.

D. Thermoplastic polymers have intermolecular forces between elastomers and fibers.

That is correct. Thermoplastic polymers have intermolecular forces that are stronger than those of elastomers but weaker than those of fibers. This is why thermoplastic polymers can be softened and reshaped when heated, but they cannot be stretched as far as elastomers and are not as strong as fibers.

In summary, the incorrect statement is A, as Bakelite and urea-formaldehyde resins are not elastomers but rather thermosetting polymers.