Question

• A. Neoprene
• B. Buna-N
• C. Novolac
• D. Acrilan

Hint:

Novolac is the {linear} precursor used in paints and as a binder. Bakelite is the {cross-linked} (3D) thermosetting plastic used for electrical switches and handles.

Answer 1

The Correct Option is C

The given image displays a repeating unit of a polymer which contains phenolic groups with methylene bridges connecting the phenol rings.

This structure is characteristic of Novolac.

1. Understanding Novolac:
   • Novolac is a type of phenolic resin.
   • It is formed by the polymerization of phenol with formaldehyde under acidic conditions.
   • The methylene (-CH₂-) bridges, which connect the phenolic rings, are typical of Novolac polymers.
2. Justification for the Correct Answer:
   • The repeating unit shown matches the structure of Novolac, characterized by phenolic rings linked via methylene bridges.
3. Eliminating Other Options:
   • Neoprene: A synthetic rubber made through the polymerization of chloroprene. It does not involve phenol.
   • Buna-N: A type of synthetic rubber also known as Nitrile rubber, with repeating units of butadiene and acrylonitrile, not phenol.
   • Acrilan: Known as acrylic fiber, consists of acrylonitrile repeating units, not related to phenol.

Thus, the correct answer is Novolac.