Q25 of 30 Page 1

Write the names and structures of the monomers of the following polymers:

(i) Buna-S


(ii) Neoprene


(ii) Nylon-6,6


(i) Buna-S is prepared from two monomers, 1,3-butadiene() and Styrene().



(ii) Neoprene (also known as polychloropropene) is a polymer formed from chloroprene which is 2-chloro-1,3-butadiene through polymerization by production of free radicals in the intermediate stages of the reaction. It is thus called free radical polymerization.



(iii) Nylon-6,6 is a copolymer of hexamethylenediamine and adipic acid through condensation polymerisation. The polymerisation type is named such because after the end of the reaction a simple molecule(here, H2O) is released.



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23

Write the IUPAC names of the following coordination compounds:

(i) [Cr(NH3)3Cl3]


(ii) K3[Fe(CN)6]


(iii)[CoBr2(en)2]+, (en=ethylenediamine)


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Give the structures of A, B and C in the following reactions:

(i)


(ii)


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After watching a programme on TV about the adverse effects of junk food and soft drinks on the health of school children, Sonali, a student of Class XII, discussed the issue with the school principal. Principal immediately instructed the canteen contractor to replace the fast food with the fibre and vitamins rich food like sprouts, salad, fruits etc. This decision was welcomed by the parents and the students.

After reading the above passage, answer the following questions:


(a) What values are expressed by Sonali and the Principal of the school?


(b) Give two examples of water-soluble vitamins.


 27

(a) Which one of the following is a food preservative?

Equanil, Morphine, Sodium benzoate


(b) Why is bithional added to soap?


(c) Which class of drugs is used in sleeping pills?