Short Answer TypeHow is phenol-formaldehyde resin prepared? How can it be converted into bakelite?
When p-hydroxymethyl phenols react with phenol to form compounds, having rings joined to each other through -CH2 groups. This the know as Novolac.
Novolac on heating with formaldehyde undergoes cross-linking to form an infusible solid mass called bakelite.
Write the names and structures of the monomers of the following polymers
(i) Nylon-6, 6
(ii) PHBV
(iii) Neoprene
After the ban on plastic bags, students of a school decided to make people aware of the harmful effects of plastic bags on the environment and Yamuna River. To make the awareness more impactful, they organised a rally by partnering with other schools and distributed paper bags to vegetable vendors, shopkeepers and departmental stores. All the students pledged not to use polythene bags in the future to save the Yamuna River.
After reading the above passage, answer the following questions:
<(i) What values are shown by the students?
(ii) What are bio-degradable polymers? Give one example.
(iii) Is polythene a condensation or an addition polymer ?
(a) Write the mechanism of the following reaction :
CH3-CH2-OH 
CH3-CH2-Br + H2O
(b) Write the equation involved in Reimer-Tiemann reaction.
Write the names and structure of the monomers of the following polymers:
(i) Buna- S
(ii) Neoprene
(iii) Nylon-6, 6
Draw the structure of the monomer for each of the following polymers:
(i) Nylon 6
(ii) Polypropene
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