UPSC Combined Geo-Scientist, Mains · 2016 · Mains Paper III
Q7(i). Carbonyl stretching order
Question
Order the carbonyl stretching frequencies of A cyclohexanone, B delta-valerolactone and C delta-valerolactam.
Answer in brief
ν_B>ν_A>ν_C.
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.
CoversCarbonyl stretching orderInfrared spectroscopy
All parts of Question 7
- 7(a) Acidity and hybridisation4 marks
- 7(b) Dichlorocarbene addition4 marks
- 7(c) Grignard addition to a keto ester4 marks
- 7(d) Dipole moment of cyclopropenone4 marks
- 7(e) Cannizzaro reaction4 marks
- 7(f) Frontier orbital nodes4 marks
- 7(g) Keto–enol claim: correction4 marks
- 7(h) Hofmann rearrangement and oxidation4 marks
- 7(i) Carbonyl stretching order4 marks
- 7(j) Carbon count from isotope peaks4 marks