Which of the following statements is incorrect?

  • A
    Artificial silk is derived from cellulose.
  • B
    $Nylon-66$ is an example of an elastomer.
  • C
    Isoprene is the repeating unit in natural rubber.
  • D
    Both starch and cellulose are polymers of glucose.

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Identify the condensation polymers from the following:
$A$. $PHBV$
$B$. Buna$-N$
$C$. Neoprene
$D$. Nylon$-6$
$E$. Glyptal

Which one of the following polymers will not catch fire?

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Write a short note on the melamine-formaldehyde polymer.

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Ethylene on reaction with cold,dilute alkaline $KMnO_4$ at $273 \ K$ gives a compound '$P$'. This on polymerisation with which of the following gives dacron?

Explain the preparation of polyacrylonitrile and also write down its uses.

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