Which of the following is NOT true about natu | vedclass

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(D) $1$. It is formed by addition polymerization: Natural rubber is formed by the addition polymerization of isoprene units. This is correct.$2$. It i

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It contains butadiene and styrene as monomer units.

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(D) $1$. It is formed by addition polymerization: Natural rubber is formed by the addition polymerization of isoprene units. This is correct.$2$. It is a linear polymer: Natural rubber is primarily a linear polymer of isoprene,although it may have a slight degree of branching. This is correct.$3$. It has cis configuration of $C=C$: Natural rubber has $cis-1,4-polyisoprene$ as its primary structure,which gives it elasticity. This is correct.$4$. It contains butadiene and styrene as monomer units: This is incorrect. Butadiene and styrene are the monomers of synthetic rubber known as styrene-butadiene rubber $(SBR)$,not natural rubber. Natural rubber contains isoprene $(2-methyl-1,3-butadiene)$ as its monomer.

Which of the following is $NOT$ true about natural rubber?

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