Which amongst the following molecules on polymerization produces neoprene?
(1) H₂C=CH–CH=CH₂
(2) H₂C

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Question

Which amongst the following molecules on polymerization produces neoprene?
(1) H₂C=CH–CH=CH₂
(2) H₂C=C(Cl)–CH=CH₂
(3) H₂C=CH–C≡CH
(4) H₂C=C(CH₃)–CH=CH₂

Accepted Answer

Correct Answer: B — 2-chlorobuta-1,3-diene (Chloroprene)Step-by-step Solution:Neoprene is a synthetic rubber produced by free radical addition polymerization of chloroprene (2-chlorobuta-1,3-diene: H₂C=C(Cl)–CH=CH₂).nCH₂=C(Cl)–CH=CH₂ → [–CH₂–C(Cl)=CH–CH₂–]ₙ (Neoprene/Polychloroprene)Why other options are wrong:Option A — Buta-1,3-diene (H₂C=CH–CH=CH₂): Polymerization gives polybutadiene (Buna rubber), a synthetic rubber, but NOT neoprene.Option C — Vinylacetylene (H₂C=CH–C≡CH): This compound does not directly polymerize to give neoprene. It is a monomer used in the preparation of chloroprene (vinylacetylene + HCl → chloroprene), but is NOT the direct monomer for neoprene.Option D — Isoprene (2-methylbuta-1,3-diene, H₂C=C(CH₃)–CH=CH₂): Polymerization gives polyisoprene, which is the structural unit of natural rubber (latex from Hevea brasiliensis). NOT neoprene.Key Concepts:Neoprene (polychloroprene): Monomer = chloroprene (2-chlorobuta-1,3-diene). Has good resistance to oil, heat, ozone, and weather. Used in wetsuits, gloves, hoses.Natural rubber (polyisoprene): Monomer = isoprene (cis-1,4-polyisoprene).Polybutadiene (Buna rubber): Monomer = buta-1,3-diene.Buna-S/SBR: Copolymer of butadiene + styrene. Used in tyres.Buna-N/Nitrile rubber: Copolymer of butadiene + acrylonitrile. Oil-resistant.

Which amongst the following molecules on polymerization produces neoprene? (1) H₂C=CH–CH=CH₂ (2) H₂C=C(Cl)–CH=CH₂ (3) H₂C=CH–C≡CH (4) H₂C=C(CH₃)–CH=CH₂

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Which amongst the following molecules on polymerization produces neoprene? (1) H₂C=CH–CH=CH₂ (2) H₂C=C(Cl)–CH=CH₂ (3) H₂C=CH–C≡CH (4) H₂C=C(CH₃)–CH=CH₂

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