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Although both polymers are prepared by free radical processes, poly (vinyl chloride) is amorphous and poly (vinylidene chloride)(saran) is highly crystalline. How do you account for the different? (vinylidene chloride is I, I-dichloroethene).

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As poly(vinyl chloride) is able to show stereoisomerism and further it is formed by a free radical process, it is atactic (chlorine atoms distributed randomly), the molecules fit together poorly.
Poly (vinylidene chloride) has two identical substitutents on each carbon and the chains fit together well.
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Read the passage given below and answer the following questions: Alkyl/Aryl halides may be classified as mono, di or polyhalogen compounds depending on one, two or more halogen atoms in their structures. Alkyl halides are prepared by free radical halogenation of alkanes, addition of halogen acids to alkenes and replacement of -OH group of alcohols with halogens using phosphorus halides, thionyl chloride or halogen acids. Aryl halides are prepared by electrophilic substitution to arenes. The following questions are multiple choice questions. Choose the most appropriate answer: Arrange the following compounds in increasing order of their boiling points. (i)

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Monomers are simple molecules, which combine with each other to form polymers. Each polymer has a repeating structural unit. Polymers formed the same type of monomers are called homopolymers and if two or more different repeating units (monomers) make up the polymer, it is known as a copolymer. Both homopolymers and copolymers may be formed either by addition or condensation reactions. Alkenes and diense polymerize by addition (chain growth) mechanism involving carbocations, carbanions or free radical intermediates. Diense (Chloroprene, isoprene, etc) polymerize by 1,4-addition mechanism to give cis- or trans- polymers. Natural rubber is, however, cis- polyisoprene. Natural rubber is quite soft and flexible but these properties can be improved by a process called vulcanization. In contrast, bifunctional monomer molecules undergo condensation or step-growth polymerization. Polymers which can be heated and reshaped as many times as desired are called thermoplastics (polythene, polystyrene, PVC teflon, etc.) while those which can be heated only once to give a particular shape are called thermosetting polymers (Bakelite, Melmac, etc). Vinyl chloride is the repeating unit in:

MOTION-BIOMOLECULES & POLYMERS-EXERCISE - 4 (LEVEL II)
  1. Although both polymers are prepared by free radical processes, poly (v...

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  2. Which of the following pairs give positive Tollen's test ?

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  3. The two forms of D-glucopyranose obtained from solution of D-glucose a...

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  4. Match the chemical substances in Column I with type of polymers/type o...

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  5. Cellulose upon acetylation with excess acetic anhydride/H(2)SO(4) (cat...

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  6. Among cellulose, poly (vinyl chloride), nylon and natural rubber, the ...

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  7. The correct statement(s) about the following sugars (X) and (Y) is//ar...

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  8. The correct statement about the following disaccharide is

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  9. The total number of basic groups in the following form of lysine is

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  10. The following carbohydrate is

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  11. The substituents R(1) and R(2) for nine peptides are listed in the tab...

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  12. The total number of distinct naturally occuring amino acids obtained b...

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  13. The total number of lone-pairs of electrons in melamine is.

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  14. A tetrapeptide has -COOH group on alanine. This produces glycine (Gly)...

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  15. The structure of D-(+)- glucose is The structure of L-(-) glucose...

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  16. For 'invert sugar' the correct statement is (Given : specific rotati...

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  17. On complete hydrogenation, natural rubber produces

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  18. The Fischer presentation of D-glucose is given below. the correct...

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