Indian Forest Service (Mains), Chemistry optional · 2021 · Paper II
Q6(c)(ii). Terylene from p-xylene
Question
Describe the synthesis of terylene from p-xylene and identify the IR bands of functional groups giving low percentage transmittance.
Answer in brief
Oxidize p-xylene to terephthalic acid, then polycondense it with ethylene glycol to form poly(ethylene terephthalate), PET or terylene.
Part of VKC Basic
Read the key points and the full model answer with VKC Basic
VKC Basic (₹999 for 6 months) opens every solved answer, the notes, the handbook and the daily answer archive. Every Mains test series includes it.
The full model answer
As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.
The handwritten model answer pages open with the VKC plan.
CoversterylenePETterephthalic acidpolycondensationester C=O IR band
All parts of Question 6
- 6(a)(i) Malonic ester ring synthesis5 marks
- 6(a)(ii) Wittig olefination5 marks
- 6(b)(i) Tertiary protein structure5 marks
- 6(b)(ii) End-group content of polystyrene5 marks
- 6(c)(i) Cyclization of a beta-hydroxy phenethylamide5 marks
- 6(c)(ii) Terylene from p-xylene5 marks
- 6(d) Fischer indole synthesis5 marks
- 6(e) Acid equivalent of nylon-6,65 marks