JEE Main levelSingle correct optionDifficulty 2 of 3pl081
In vulcanisation of polyisoprene, sulfur cross-links are believed to attach mainly at
Athe allylic carbon atoms next to the C=C bonds
Bthe carbonyl carbons of the chain
Cthe chain-end hydroxyl groups only
Dcarbon atoms far from any double bond, because these are the most reactive
Answer: A
Polyisoprene has C=C bonds, and the allylic C−H positions beside them are the reactive sites where sulfur bridges form. The chain contains no carbonyl or hydroxyl groups.