Question

Which polymer is made by novolac and formaldehyde addition?

• A. melamine
• B. Bakelite
• C. Polyester
• D. None of the above.

Answer 1

The correct option is B

Bakelite

Explanation for the correct option:

Option (B):

• Bakelite is the type of polymer made up of monomer phenol and formaldehyde.
• It is a thermosetting polymer.

The structure of Bakelite.

Preparation of Bakelite:

• Bakelite is obtained when Novolac is allowed to undergo cross-linking in the presence of a cross-linking agent.
• In general, phenol taken in excess acts as the cross-linking agent.

Uses of Bakelite:

• Manufacturing of switches.
• Used as a thermosetting polymer.
• Used as an adhesive and binding.

Explanation for the incorrect option:

• Option (A) melamine is obtained when dicyandiamide, hydrogen cyanide, or urea.
• Option (C) polyester is obtained from petroleum.
• Option (D) is incorrect as an option (A) is the correct choice.

Hence, option (B) is the correct option.