Which of the following is not a semi-syntheti | vedclass

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(A) Semi-synthetic polymers are derived from naturally occurring polymers by chemical modifications. $1$. Cellulose nitrate and cellulose acetate are

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cis-Isoprene

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(A) Semi-synthetic polymers are derived from naturally occurring polymers by chemical modifications. $1$. Cellulose nitrate and cellulose acetate are semi-synthetic polymers derived from cellulose. $2$. Vulcanized rubber is a semi-synthetic polymer where natural rubber is treated with sulfur. $3$. $cis$-Isoprene is the monomer unit of natural rubber,which is a natural polymer,not a semi-synthetic one.

Which of the following is not a semi-synthetic polymer?

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