JEE Main Chemistry question
Not in JEE Main or NEET syllabus
How many of the following has isoprene as one of the monomer?
Terpenes, Neoprene rubber, Natural rubber, Butyl rubber, Styrofoam, Vitamin A.
Answer: 4
Solution
Terpenes are naturally built from isoprene units (isoprene rule) — counts. Neoprene rubber is made from chloroprene, not isoprene — does not count. Natural rubber is cis-1,4-polyisoprene, directly built from isoprene — counts. Butyl rubber is a copolymer of isobutylene with a small proportion of
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