Q. 21

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Answer :

buna.jpg


(a)This is structure of Buna- S rubber made from two monomer units tat are 1,3-butadiene and styrene.


(b)Polyvinyls belongs to the category of thermoplastic polymers if classified on the basis of molecular forces. That are bonded with weak van der wall forces and can be easily shaped and reshaped by heating and cooling.


(c) Terylene is a polymer which gets it name from the monomer units it is formed. These are ethylene glycol and terepthalic acid.



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