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Standard XII
Chemistry
Question

Which of the following is not correct regarding terylene ?
  1. Synthetic fibre
  2. Condensation polymer
  3. Step-growth polymer
  4. Known as dacron
  5. Thermosetting plastic

A
Synthetic fibre
B
Step-growth polymer
C
Condensation polymer
D
Known as dacron
E
Thermosetting plastic
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Solution
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Terylene is a synthetic polymer formed by the condensation polymerization reaction of terephthalic acid and ethylene glycol with the release of a methanol molecule.

It forms by a step-growth polymerization mechanism in which a bi-functional or multifunctional monomer react to form the first dimer, then trimer, longer oligomer and eventually long-chain polymers.

It is also called as Dacron and is a thermoplastic, which can be remelted time and again without producing any change.

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Which of the following is not correct regarding terylene?
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Q2

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Indicate whether the following statements are true or false. Also write the false statements in their correct form.

(i) The fabric terry wool is obtained by mixing terylene and wool.
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The synthetic polymer which can be used as a substitute for wool for making sweaters and shawls, etc., is :

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The synthetic fibre which contains the organic group similar to those which give fruits their 'sweet smell' is :

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