Q21 of 26 Page 1

(i) Identify the monomer in the following polymeric structure: [ CH2-CH=CH-CH2-CH2-CHCN]n


(ii) On the basis of forces between their molecules in a polymer to which class does neoprene belong?


(iii) Can both addition and condensation polymerization result in the formation of a copolymer?


(i)


• The monomer of the given polymer can be determined from the given polymeric structure and is CH2-CH=CH-CH2-CH2-CHCN.


(ii)


• On the basis of forces between molecules of a polymer neoprene being a member of the synthetic rubber family can be classified as elastomer as in this type of polymers the polymeric chains are held together by weak intermolecular forces.



(iii)


• Copolymerisation is a polymerisation reaction in which a mixture of more than one monomeric units are allowed to polymerise and form a copolymer.


• The copolymer can be made not only by addition polymerisation(chain growth polymerisation) but also by condensation polymerisation (step growth polymerisation) also.


Hence both addition and condensation polymerization can give result to the formation of a copolymer.


More from this chapter

All 26 →
19

(a) Give one chemical test to distinguish between the following pairs of compounds:

(i) Methylamine and dimethylamine.


(ii) Aniline and benzylamine


(b) Write the structures of different isomers corresponding to the molecular formula C3H9N, which will liberate nitrogen gas on treatment with nitrous acid.


 20

(a) Exemplify the following reactions:

(i) Rosenmund reduction reaction.


(ii) Kolbe electrolysis reaction


(b) Arrange the following compounds in increasing order of their reactivity towards HCN:


Acetaldehyde, Acetone, Di-tert-butyl ketone.


OR


(a) Predict the products of the following reactions:


(i)




(b) Arrange the following compounds in increasing order of acid strength: Benzoic acid, 4-Nitrobenzoic acid, 4-Methoxybenzoic acid.


 22

(i) Which of the following biomolecule is insoluble in water? Justify.


Insulin, Haemoglobin, Keratin.


(ii) Draw the Haworth structure for α-D-Glucopyranose.


(iii) Write chemical reaction to show that glucose contains aldehyde as carbonyl group.


 23

John had gone with his mother to the doctor as he was down with fever. He then went to the chemist shop with his mother to purchase medicines prescribed by the doctor. There he observed a young man pleading with the chemist to give him medicines as he had nasal congestion. The chemist gave him cimetidine. John advised and also explained to the young man that he should only take the medicines prescribed by the doctor.

Answer the following questions:


(a) Did the chemist give an appropriate medicine? Justify your answer.


(b) John’s action was appreciated by his mother. List any two reasons.