Multiple choice

Which of the following statements is/are incorrect?

  1. Styrene–butadiene block copolymer belongs to the A-B-A type thermosetting polymer.
  2. Cellulose ethers are more sensitive to hydrolysis than cellulose.
  3. Tetramethylthioureadisulfide is used as accelerator in vulcanisation of rubber.

  1. Only 1

  2. 2 only

  3. Only 3

  4. Only 1 and 2

  5. Only 2 and 3
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Styrene–butadiene block copolymer belongs to the A-B-A type thermoplastic elastomer. The formation of cellulose ethers, unlike that of cellulose esters, is not reversible. Cellulose ethers are therefore less sensitive to hydrolysis than cellulose esters.

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