Which from following is NOT true about natural rubber?

Step-by-step solution

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. Butad