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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pl195

Which of the following statements about natural rubber and gutta-percha is/are correct? (One or more options may be correct.)

  1. AGutta-percha is more elastic than natural rubber because its chains pack more regularly.
  2. BThe two are geometrical isomers with the same repeat-unit formula .
  3. CGutta-percha has trans-configured double bonds along the chain.
  4. DNatural rubber has cis-configured double bonds along the chain.

Answer: B, C, D

Both are 1,4-polyisoprene; they differ only in the geometry (cis or trans) at each . Regular packing in the trans form gives a hard, inelastic material, so the fourth statement is false.
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