Chemistry - Polymer Question with Solution | TestHub

Option (A) - Natural Rubber (Correct)

* Monomer: The monomer of natural rubber is isoprene (2-methylbuta-1,3-diene).

* Structure: The chemical structure shown in the image is $H_{2}C=C(H_{3}C)-CH=C{H}_2$, which is completely correct.

Option (B) - Dacron (Incorrect)

* Monomer: Dacron is made from terephthalic acid and ethylene glycol.

* Error: Terephthalic acid must contain an aromatic benzene ring (with alternating double bonds). However, the image incorrectly shows a saturated cyclohexane ring.

Option (C) - Nylon-6 (Incorrect)

* Monomer: The monomer for Nylon-6 is Caprolactam.

* Error: While the ring shown in the image is indeed a 7-membered ring, it is not Caprolactam. In caprolactam, the carbonyl group ($C=O$) and the amine group ($NH$) must be directly bonded to each other to form a lactam functional group ($-C(=O)-NH-)$.

* In the given image, there is a $C{H}_2$ carbon separating the $C=O$ and $NH$ groups, making it an incorrect structural isomer.

Option (D) - Teflon (Correct)

* Monomer: The monomer of Teflon (PTFE) is tetrafluoroethene.

* Structure: The structure shown ($C{F}_2=C{F}_2$) is completely correct.