Q19 of 47 Page 1

Write the structures of monomers used to obtain the following polymers:

a. Neoprene


b. PHBV


c. Bakelite


OR


a. Arrange the following polymers in decreasing order of their intermolecular forces :
Bakelite, Polythene, Buna-S, Nylon-6,6


b. Write the monomers of the following polymer :


c. What is the structural difference between high density polythene (HDP) and low density polythene (LDP)?



a. Monomer of Neoprene is Chloroprene.


b. Monomer of PHBV are



c. The monomers of Bakelite are Phenol and Formaldehyde



OR


a. The decreasing order of their intermolecular forces is:


Nylon 6,6 > Bakelite > Polythene > Buna – S


b. The given polymer is Glyptal. Its monomers are ethylene glycol and phthalic acid:



c. HDP is a linear chain polymer whereas LDP is a highly branched chain polymer and that is why HDP is dense and tough as compared to LDP.


More from this chapter

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17

Write down the reactions taking place in blast furnace related to the metallurgy of iron in the temperature range 500 K – 800 K. What is the role of limestone in the metallurgy of iron?

OR


What happens when


a. Silver is leached with NaCN in the presence of air?


b. Copper matte is charged into silica lined converter and hot air blast is blown?


c. NaCN is added in an ore containing PbS and ZnS during concentration by froth floatation method?


 18

Give reasons for the following:

a. Dioxygen is a gas but sulphur a solid.


b. NO (g) released by jet aeroplanes is slowly depleting the ozone layer.


c. Interhalogens are more reactive than pure halogens.


 20

a. Why are metal hydroxides better alternatives than sodium hydrogencarbonate in antacids?

b. Why is aspirin used in the prevention of heart-attacks?


c. Why antihistamines do not affect the secretion of acid in stomach?


OR


Define the following terms with a suitable example of each :


a. Tranquilizers


b. Antibiotics


c. Non-ionic detergents


 21

a. Out of and which one is more reactive towards SN2 reaction and why?

b. Out of and Which one is more reactive towards nucleophilic substitution reaction and why?


c. Out of and which one is optically active and why?