MEDIUMMCQ SINGLEJEE Mains ChemistryOrganic ChemistryPolymersPrevious Year Questions
Which one of the following statements is not true? (AIPMT 2008)
A.In vulcanisation, the formation of sulphur bridges
B.Natural rubber has the trans-configuration at every✓ Correct
C.Buna-S is a copolymer of butadiene and styrene
D.Natural rubber is a 1,4-polymer of isoprene
Explanation
The natural rubber is a polymer of isoprene unit. The isoprene units are as shown below, It may be taken into account that the natural rubber is a cis,1-4-polyisoprene and has all cis configuration about the double bond. It is as shown below, The all-trans configuration occurs naturally as gutta- percha. Thus, (b) is the correct option.
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