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

Q8(e). IR distinctions between functional groups

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

Question

Distinguish by IR: (i) p-methoxyacetophenone and p-nitroacetophenone; (ii) propanoyl chloride and 2-chloroethyl methyl ether.

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.

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Topic notes: IR spectroscopy: group frequencies, carbonyl stretching and hydrogen bonding, with every Civil Services, IFoS and Geo-Scientist PYQ →

CoversIR spectroscopycarbonyl stretching frequencynitro group bandsacid chloride C=Oether C–O stretch

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