UPSC Combined Geo-Scientist, Mains · 2018 · Mains Paper III
Q10(c)(ii). Highest carbonyl frequency
Question
Choose the highest C=O stretching frequency among a comparable amide, ester and ketone.
Answer in brief
The ester.
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.
CoversHighest carbonyl frequencyInfrared spectroscopy
All parts of Question 10
- 10(a) Phenolic OH band shapes5 marks
- 10(b) Cyclic ether identification5 marks
- 10(c)(i) Most downfield proton2 marks
- 10(c)(ii) Highest carbonyl frequency2 marks
- 10(c)(iii) Odd nominal molecular mass2 marks
- 10(c)(iv) Most upfield carbon2 marks
- 10(c)(v) Longest-wavelength diene band2 marks
- 10(d) Phenethyl alcohol spectra10 marks