Question

Which of the following polymers is used in the manufacture of wood laminates?
A. Melamine formaldehyde resin
B. cis-poly isoprene
C. Phenol and formaldehyde resin
D. Urea formaldehyde resin

Answer 1

Hint: A polymer is a complex molecule made of small repetitive units called monomers. Some examples of polymers are nylon, polyester, etc. Here, some substances are given and we have to find out the polymer that made these substances.

Complete Step by Step Solution:
Let's discuss all the options one by one:
Two monomers namely melamine and formaldehyde undergo a condensation polymerization reaction to form melamine formaldehyde. The fireproof property of this polymer is due to the release of gaseous nitrogen during the combustion process. This polymer is used in the manufacturing of plastic household crockery.

Natural rubber latex is a polymer whose monomer units are isoprene molecules. The polymerization of isoprene gives cis-1,4-polyisoprene which is natural rubber. They have naturally obtained elastomers.
Phenol formaldehyde polymer is manufactured by reacting phenol with formaldehyde through condensation polymerization using a basic or acidic catalyst. The polymers namely novolac, Bakelite, etc. are phenol-formaldehyde polymers.

Wood laminates are made of a polymer whose name is urea formaldehyde. This polymer is made from urea and formaldehyde. Some other products made from this polymer are plywood, adhesives etc.
Therefore, option D is right.

Note: Two processes of polymerization are widely used for polymer formation. They are addition polymerization and condensation polymerization. In addition to polymerization, the repetitive addition of monomers takes place. But in condensation polymerization, repetitive condensation of bi and tri-functional monomers occurs.