Question:
Natural rubber is the addition polymer of monomer X and neoprene is the addition polymer of monomer Y. What are X and Y respectively?
Natural rubber is the addition polymer of monomer X and neoprene is the addition polymer of monomer Y. What are X and Y respectively?
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Natural rubber = isoprene polymer, Neoprene = chloroprene polymer.
Updated On: Jun 15, 2026
- \(CH_2=C(CH_3)-CH=CH_2;\;CH_2=C(Cl)-CH=CH_2\)
- \(CH_2=C(CN)-CH=CH_2;\;CH_2=C(Cl)-CH=CH_2\)
- \(CH_2=C(CH_3)-CH=CH_2;\;CH_2=C(CN)-CH=CH_2\)
- \(CH_2=C(C_2H_5)-CH=CH_2;\;CH_2=C(C_6H_5)-CH=CH_2\)
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The Correct Option is A
Solution and Explanation
Concept:
Natural rubber and neoprene are both addition polymers formed via polymerization of conjugated dienes.
• Natural rubber is polyisoprene
• Neoprene is polychloroprene
Step 1: Identify monomer of natural rubber. Natural rubber is cis-1,4-polyisoprene. Monomer: \[ CH_2=C(CH_3)-CH=CH_2 \] Thus X is isoprene.
Step 2: Identify monomer of neoprene. Neoprene is polymer of chloroprene. Monomer: \[ CH_2=C(Cl)-CH=CH_2 \] Thus Y is chloroprene.
Step 3: Final answer. \[ X=CH_2=C(CH_3)-CH=CH_2,\quad Y=CH_2=C(Cl)-CH=CH_2 \] Hence option (A).
• Natural rubber is polyisoprene
• Neoprene is polychloroprene
Step 1: Identify monomer of natural rubber. Natural rubber is cis-1,4-polyisoprene. Monomer: \[ CH_2=C(CH_3)-CH=CH_2 \] Thus X is isoprene.
Step 2: Identify monomer of neoprene. Neoprene is polymer of chloroprene. Monomer: \[ CH_2=C(Cl)-CH=CH_2 \] Thus Y is chloroprene.
Step 3: Final answer. \[ X=CH_2=C(CH_3)-CH=CH_2,\quad Y=CH_2=C(Cl)-CH=CH_2 \] Hence option (A).
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