Question:
Which from following polymers is obtained by addition polymerisation method?
Which from following polymers is obtained by addition polymerisation method?
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- Vinyl group (C=C) $\Rightarrow$ addition polymer
- Amide/ester linkages $\Rightarrow$ condensation polymer
Updated On: May 4, 2026
- \([ -CH_2 - CH(CN) - ]_n\)
- \([ -CO-(CH_2)_4-CO-NH-(CH_2)_6-NH- ]_n\)
- \([ -NH-(CH_2)_5-CO- ]_n\)
- \([ -O-CH_2-CH_2-O-CO-\text{(benzene)}-CO- ]_n\)
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The Correct Option is A
Solution and Explanation
Concept:
• Addition polymerisation: Monomers add without elimination of small molecules (usually alkenes)
• Condensation polymerisation: Involves elimination of small molecules like $H_2O$, $HCl$
Step 1: Identify polymer type
• (A) \([ -CH_2-CH(CN)- ]_n\) → formed from acrylonitrile (vinyl monomer) → addition polymer (Polyacrylonitrile)
• (B) Nylon-6,6 → formed by condensation of adipic acid and hexamethylenediamine → condensation polymer
• (C) Nylon-6 → condensation polymer
• (D) Polyester (Terylene/Dacron) → condensation polymer
Step 2: Conclusion
Only option (A) is formed by addition polymerisation.
• Addition polymerisation: Monomers add without elimination of small molecules (usually alkenes)
• Condensation polymerisation: Involves elimination of small molecules like $H_2O$, $HCl$
Step 1: Identify polymer type
• (A) \([ -CH_2-CH(CN)- ]_n\) → formed from acrylonitrile (vinyl monomer) → addition polymer (Polyacrylonitrile)
• (B) Nylon-6,6 → formed by condensation of adipic acid and hexamethylenediamine → condensation polymer
• (C) Nylon-6 → condensation polymer
• (D) Polyester (Terylene/Dacron) → condensation polymer
Step 2: Conclusion
Only option (A) is formed by addition polymerisation.
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