Indian Forest Service (Mains), Chemistry optional · 2021 · Paper II

Q8(a)(i). Methylcyclohexenes by mass spectrometry

5 marks
Topic: Principles of spectroscopy and applications in structure elucidation
Question only

Question

How can mass spectrometry distinguish 3-methylcyclohexene from 4-methylcyclohexene?

Model answer

The free solution for 2021 answers questions 1, 2, 3, 5 and 6, the ones picked in its time plan. This part is not answered on the site yet. New answers are announced on Telegram.

Read the 2021 solution Join on Telegram

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.

See what is included Already a member? Sign in

Topic notes: mass spectrometry: molecular ion, metastable peak and McLafferty rearrangement, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversmass spectrometryretro-Diels–Alder fragmentationmethylcyclohexenefragmentation pattern

All parts of Question 8

8(a)(i) Methylcyclohexenes by mass spectrometry5 marks
8(a)(ii) Hydroxy-methoxyacetophenone assignment5 marks
8(b) Identification of an aromatic diester10 marks
8(c)(i) Oxidative coupling of acetic anhydride5 marks
8(c)(ii) Cyclopentenone photocycloadditions5 marks
8(d) Photochemical cycloaddition and cleavage5 marks
8(e) IR distinctions between functional groups5 marks