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JEE Main · 2021 · 31 Aug 2021 · Shift 2 · Polymers

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Which among the following is not a polyester ?
  1. (A)Glyptal
  2. (B)Dacron
  3. (C)Novolac✓ Correct
  4. (D)PHBV

Answer: (C)

Solution

Let's classify each polymer:

Polyesters (contain ester linkages -COO-):
  • Glyptal: Copolymer of ethylene glycol and phthalic acid - polyester ✓
  • Dacron (Terylene): Polymer of ethylene glycol and terephthalic acid - polyester ✓
  • PHBV: Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) - biodegradable polyester ✓

Not a polyester:
  • Novolac: Copolymer of phenol and formaldehyde (a phenol-formaldehyde resin)
  • Contains C-C linkages between phenol units, not ester linkages
  • It is a thermosetting polymer but NOT a polyester

Therefore, the answer is Novolac, option (C).

JEE Main · 2021 · 31 Aug 2021 · Shift 2 · Single correct option

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