Question

'X' is a polymer, which is mainly used for making unbreakable cups and laminated sheets. The monomers of 'X' are

• A. Urea and formaldehyde
• B. Ethylene glycol and phthalic acid
• C. Phenol and formaldehyde
• D. 1,3-Butadiene and styrene

Hint:

Melamine-formaldehyde resin is also used for unbreakable crockery ("Melmac"), but Urea-formaldehyde is the standard answer for "unbreakable cups and laminates" among these options.

Answer 1

The Correct Option is A

Step 1: Identifying the Polymer:

The description "unbreakable cups and laminated sheets" is characteristic of Urea-Formaldehyde Resin. It is a thermosetting polymer.
Step 2: Identifying Monomers:

- Urea-Formaldehyde Resin: Monomers are Urea (\( \text{NH}_2\text{CONH}_2 \)) and Formaldehyde (\( \text{HCHO} \)). - Glyptal: Monomers are Ethylene glycol and Phthalic acid (used in paints). - Bakelite: Monomers are Phenol and Formaldehyde (used for switches, handles - hard but brittle, not typically called "unbreakable cups" in the same context as melamine/urea wares). - Buna-S: Monomers are Butadiene and Styrene (Synthetic Rubber).
Step 3: Conclusion:

The polymer 'X' is Urea-Formaldehyde resin.
Step 4: Final Answer:

The monomers are Urea and formaldehyde.