Q21 of 26 Page 1

(a) Identify the monomers in the following polymeric structure:


(b) On the basis of forces between their molecules in a polymer to which class polyester belong?


(c) Give an example of step growth polymer.


(a) The polymer is Nylon 6,6 and its momomers are hexamethylenediamine with adipic acid.



(Adipic acid) (hexamethylenediamine)


(b) On the basis of forces between their molecules in a polymer, polyester belongs to fibres. Fibres are the thread forming solids which possess high tensile strength and high modulus. These characteristics can be attributed to the strong intermolecular forces like hydrogen bonding. These strong forces also lead to close packing of chains and thus impart crystalline nature.


(c) An example of step growth polymer is terylene or Dacron. The formation of terylene or dacron by the interaction of ethylene glycol and terephthalic acid is an example of this type of polymerisation.


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19

Write the reactions of Phenol with:

(i) Br2 water (ii) dil. HNO3 (iii) Zn dust


 20

(a) Give chemical tests to distinguish between the following pairs of compounds.

(i) (CH3)2NH and (CH3)3N


(ii) Aniline and Ethylamine


(b) Write IUPAC name of CH3CH2NHCH3.


 22

Define the following terms:

(i) Antacids (ii) Antiseptic (iii) Tranquillizers


 23

Sheela, domestic helper of Mrs. Vimla, fainted while sweeping the floor. Mrs. Vimla immediately took her to the nearby hospital where she was diagnosed to be severely anaemic. The doctor prescribed an iron rich diet and multi vitamins supplement to her. Mrs. Vimla supported her financially to get the medicines. After a month, Sheela was diagnosed to be normal.

After reading the above passage, answer the following questions.


(i) Name the vitamin whose deficiency causes pernicious anaemia.


(ii) What are vitamins and how are they classified?


(iii) What values (any two) are displayed by Mrs. Vimla?