Which one of the following statements is not true?

  • A
    $Buna-S$ is a copolymer of butadiene and styrene.
  • B
    Natural rubber is a $1,4$-polymer of isoprene.
  • C
    In vulcanization,the formation of sulphur bridges between different chains makes rubber harder and stronger.
  • D
    Natural rubber has the $trans$-configuration at every double bond.

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