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 Multiple Choice QuestionsLong Answer Type

141.

Elaborate the structure of natural rubber.

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142. Why does styrene undergo anionic polymerization easily?
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143. Explain how does 1, 3-butadiene polymerize by different routes?
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144.

Give the monomers and uses of each of the following addition polymers:
(a) Polyethylene    

(b) Polypropylene       

(c) Polystyrene.

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145. How does the presence of benzoquinone inhibit the free radical polymerization of a vinyl derivative?
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146.

What are linear polymer and branched chain polymers? How do these differ from own linked polymers?

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 Multiple Choice QuestionsShort Answer Type

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147.

Define a polymer. Write the monomer used for the preparation of dacron. Mention a use of it.


A polymer is large but single chain-like molecule in which the repeating units derived from small molecules called monomers, are covalently linked. The process by which monomers are transformed into a polymer is called polymerization. 

The monomers used for dacron is ethylene glycol (ethane-1,2-diol) and terephthalic acid (1,4-benzene dicarboxylic acid).
It gives a strong fibre hence used to blend cotton in clothing.



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148.

Explain with suitable examples:
(i)    Natural polymers
(ii)   Synthetic polymers.

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149.

Write the names and molecular structure of the monomers of the following:
(i) Natural rubber (ii) Neoprene.

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150.

Write the names and structures of the monomers of the following polymers:
(i) Polystyrene (ii) Neoprene.

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