Question:
Pick the wrong statement.
Pick the wrong statement.
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To remember the isomers: Cis is Coiled (elastic/natural rubber). Trans is Tough/Straight (rigid/Gutta-percha).
Updated On: May 20, 2026
- Latex are coagulated by adding dilute acetic acid.
- Styrene-butadiene rubber is prepared by emulsion polymerization.
- Vulcanized rubber is a 3-D structured polymer.
- Guttapercha is cis-polyisoprene
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The Correct Option is D
Solution and Explanation
Concept:
This question tests fundamental knowledge of natural and synthetic rubber chemistry, specifically isomers and production methods.
Step 1: Evaluate statements (1), (2), and (3).
• (1): True. Dilute acids like acetic or formic acid are standard agents to coagulate natural rubber latex.
• (2): True. SBR (Styrene-Butadiene Rubber) is primarily produced via emulsion polymerization (often called "Cold Rubber").
• (3): True. The sulfur cross-links in vulcanized rubber create a three-dimensional network structure.
Step 2: Evaluate statement (4).
Natural rubber and Gutta-percha are both polymers of isoprene, but they are geometric isomers:
• Natural Rubber: is cis-1,4-polyisoprene (elastic).
• Gutta-percha: is trans-1,4-polyisoprene (rigid and non-elastic). Therefore, statement (4) is wrong because it identifies Gutta-percha as the cis isomer instead of the trans isomer.
Step 1: Evaluate statements (1), (2), and (3).
• (1): True. Dilute acids like acetic or formic acid are standard agents to coagulate natural rubber latex.
• (2): True. SBR (Styrene-Butadiene Rubber) is primarily produced via emulsion polymerization (often called "Cold Rubber").
• (3): True. The sulfur cross-links in vulcanized rubber create a three-dimensional network structure.
Step 2: Evaluate statement (4).
Natural rubber and Gutta-percha are both polymers of isoprene, but they are geometric isomers:
• Natural Rubber: is cis-1,4-polyisoprene (elastic).
• Gutta-percha: is trans-1,4-polyisoprene (rigid and non-elastic). Therefore, statement (4) is wrong because it identifies Gutta-percha as the cis isomer instead of the trans isomer.
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