Question:
Which one of the polymers does not contain \(-COO-\) linkage in its structure?
Which one of the polymers does not contain \(-COO-\) linkage in its structure?
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Bakelite is a phenol-formaldehyde thermosetting polymer, whereas Glyptal, PHBV, and Dacron are polyesters.
Updated On: Jun 17, 2026
- Bakelite
- Glyptal
- PHBV
- Dacron
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The Correct Option is A
Solution and Explanation
Concept:
The linkage
\[
-COO-
\]
is an ester linkage. Polyesters contain this functional group in their repeating units.
Step 1: Analyze Glyptal Glyptal is a polyester. Hence it contains ester linkages.
Step 2: Analyze PHBV PHBV is a biodegradable polyester. Therefore it contains \(-COO-\) groups.
Step 3: Analyze Dacron Dacron (PET) is also a polyester. Thus it contains ester linkages.
Step 4: Analyze Bakelite Bakelite is a phenol-formaldehyde resin. Its structure contains methylene bridges: \[ -CH_2- \] and not ester groups. Hence Bakelite does not contain \(-COO-\) linkage. \[ \boxed{\text{Bakelite}} \]
Step 1: Analyze Glyptal Glyptal is a polyester. Hence it contains ester linkages.
Step 2: Analyze PHBV PHBV is a biodegradable polyester. Therefore it contains \(-COO-\) groups.
Step 3: Analyze Dacron Dacron (PET) is also a polyester. Thus it contains ester linkages.
Step 4: Analyze Bakelite Bakelite is a phenol-formaldehyde resin. Its structure contains methylene bridges: \[ -CH_2- \] and not ester groups. Hence Bakelite does not contain \(-COO-\) linkage. \[ \boxed{\text{Bakelite}} \]
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