Q19 of 36 Page 1

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

(i) Nylon-6,6


(ii) Glyptal


(iii) Buna-S


OR


(i)


(ii) Write the monomers of the following polymer :



(iii) What is the role of Sulphur in the vulcanization of rubber?


(i) Nylon 6,6 is a polyamide, a polymer derived from the condensation reaction of monomers containing terminal Carboxylic acid(-COOH) and amine (-NH2) groups.



(ii) Glyptal is formed using phthalic anhydride and glycerol monomer. The addition of this hydroxyl group allows for extensive branching during polymerization.



(iii) Buna-S has monomers as styrene and 1,3-butadiene. It is a synthetic rubber formed by co-polymerisation of these two monomers.



OR


(i) This is a homopolymer formed by a propene monomer because in this polymerisation only one monomer is being used without losing any molecule.


(ii) Monomers of melamine formaldehyde is melamine and formaldehyde



(iii) Sulfur is used in vulcanisation to produce cross-links between two polymer chains to produce more tensile strength, elasticity and resistance to abrasion.


More from this chapter

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17

(a) Name the method of refining which is

(i) used to obtain semiconductor of high purity,


(ii) used to obtain low boiling metal.


(b) Write chemical reactions taking place in the extraction of copper from Cu2S.


 18

Give reasons for the following:

(i) Transition elements and their compounds act as catalysts.


(ii) E° value for (Mn2+|Mn) is negative, whereas for (Cu2+|Cu) is positive.


(iii) Actinoids show irregularities in their electronic configuration.


 20

(i) What type of drug is used in sleeping pills?

(ii) What type of detergents are used in toothpastes?


(iii) Why the use of alitame as artificial sweetener is not recommended?


OR


Define the following terms with a suitable example in each :


(i) Broad-spectrum antibiotics


(ii) Disinfectants


(iii) Cationic detergents


 21

(i) Out of (CH3)3C–Br and (CH3)3C–I, which one is more reactive towards SN1 and why?

(ii) Write the product formed when p-nitrochlorobenzene is heated with aqueous NaOH at 443 K, followed by acidification.


(iii) Why dextro and laevo – rotatory isomers of Butan-2-ol are difficult to separate by fractional distillation?