251.

Write the names of monomers used for getting the following polymers:

(i) Bakelite
(ii) Neoprene

Write the structures of the monomers used for getting the following polymers:
Dacron

Write the structures of the monomers used for getting the following polymers:
Melamine – formaldehyde polymer

Write the structures of the monomers used for getting the following polymers:
Buna-N

Shyam went to a grocery shop to purchase some food items. The shopkeeper packed all the items in polythene bags and gave them to Shyam. But Shyam refused to accept the polythene bags and asked the shopkeeper to pack the items in paper bags. He informed the shopkeeper about the heavy penalty imposed by the government for using polythene bags. The shopkeeper promised that he would use paper bags in future in place of polythene bags.

Answer the following :

(a) Write the values (at least two) shown by Shyam

(b) Write one structural difference between low-density polythene and high-density polythene.

(c) Why did Shyam refuse to accept the items in polythene bags?

(d) What is a biodegradable polymer ? Give an example

The two monomers used in the preparation of dextron are

• 3-hydroxy butanoic acid and 3-hydroxy pentanoic acid

• ∈ amino caproic acid and glycine

• isobutylene and isoprene

• lactic acid and glycolic acid

Which of the following statements about low-density polythene is false?

• It is a poor conductor of electricity

• Its synthesis requires dioxygen or a peroxide initiator as a catalyst.

• It is used in the manufacture of buckets, dustbins etc.

• It is used in the manufacture of buckets, dustbins etc.

Which polymer is used in the manufacture of paints and lacquers?

• Bakelite

• Glyptal

• Polypropene

• Polypropene

Which one is classified as a condensation polymer?

• Dacron

• Neoprene

• Teflon

• Teflon

The polymer containing strong intermolecular forces e.g. hydrogen bonding is

• natural rubber

• Teflon

• Nylon 6,6

• Nylon 6,6