Question:
Which from following polymers does NOT contain either -COO- or -CO-NH- linkage in it?
Which from following polymers does NOT contain either -COO- or -CO-NH- linkage in it?
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Condensation polymers (like Glyptal, Dacron, Nylon) are built specifically by creating ester ($-\text{COO}-$) or amide ($-\text{CONH}-$) bridges between monomers. Addition polymers (like Teflon, PVC, Polystyrene) usually just snap their $\text{C=C}$ double bonds into long, unbroken carbon chains!
Updated On: Jun 19, 2026
- Perspex
- Polyacrylamide
- Glyptal
- Thermocol
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Question:
The question asks to identify a polymer that is neither a polyester (contains ester $-\text{COO}-$ linkages) nor a polyamide (contains amide $-\text{CONH}-$ linkages).
Step 2: Detailed Explanation:
Let's analyze the chemical structure and synthesis of each polymer:
(a) Perspex: Also known as PMMA or Polymethyl methacrylate. It is an addition polymer, but its monomer (methyl methacrylate) contains an ester group ($-\text{COOCH}_3$). Therefore, it contains $-\text{COO}-$ linkages.
(b) Polyacrylamide: An addition polymer formed from the monomer acrylamide ($\text{CH}_2\text{=CH-CONH}_2$). The monomer itself contains a highly distinct amide group ($-\text{CONH}_2$). Therefore, it contains $-\text{CONH}-$ linkages.
(c) Glyptal: A classic condensation copolymer formed from ethylene glycol and phthalic acid. Because an alcohol reacts with a carboxylic acid, it forms a massive network of ester linkages. Therefore, it is a polyester containing $-\text{COO}-$ linkages.
(d) Thermocol: The commercial name for expanded Polystyrene. It is an addition polymer synthesized exclusively from the monomer styrene (vinylbenzene, $\text{C}_6\text{H}_5\text{-CH=CH}_2$). The polymerization strictly involves the breaking of the carbon-carbon double bond, resulting in a polymer backbone consisting entirely and exclusively of only carbon atoms, with bulky phenyl rings hanging off the side. It completely lacks any oxygen or nitrogen atoms in its main structure, meaning there are absolutely no ester or amide linkages.
Step 3: Final Answer:
Thermocol does not contain either linkage, matching option (d).
The question asks to identify a polymer that is neither a polyester (contains ester $-\text{COO}-$ linkages) nor a polyamide (contains amide $-\text{CONH}-$ linkages).
Step 2: Detailed Explanation:
Let's analyze the chemical structure and synthesis of each polymer:
(a) Perspex: Also known as PMMA or Polymethyl methacrylate. It is an addition polymer, but its monomer (methyl methacrylate) contains an ester group ($-\text{COOCH}_3$). Therefore, it contains $-\text{COO}-$ linkages.
(b) Polyacrylamide: An addition polymer formed from the monomer acrylamide ($\text{CH}_2\text{=CH-CONH}_2$). The monomer itself contains a highly distinct amide group ($-\text{CONH}_2$). Therefore, it contains $-\text{CONH}-$ linkages.
(c) Glyptal: A classic condensation copolymer formed from ethylene glycol and phthalic acid. Because an alcohol reacts with a carboxylic acid, it forms a massive network of ester linkages. Therefore, it is a polyester containing $-\text{COO}-$ linkages.
(d) Thermocol: The commercial name for expanded Polystyrene. It is an addition polymer synthesized exclusively from the monomer styrene (vinylbenzene, $\text{C}_6\text{H}_5\text{-CH=CH}_2$). The polymerization strictly involves the breaking of the carbon-carbon double bond, resulting in a polymer backbone consisting entirely and exclusively of only carbon atoms, with bulky phenyl rings hanging off the side. It completely lacks any oxygen or nitrogen atoms in its main structure, meaning there are absolutely no ester or amide linkages.
Step 3: Final Answer:
Thermocol does not contain either linkage, matching option (d).
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