Indian Forest Service (Mains), Chemistry optional · 2025 · Paper II

Q7(b)(ii). Conjugated and non-conjugated ketones

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

Question

Estimate the UV maxima of the two displayed carbonyl compounds using Woodward–Fieser rules. [structures given in the paper]

Model answer

The free solution for 2025 answers questions 1, 3, 4, 5 and 8, 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: UV spectroscopy and Woodward–Fieser rules, with every Civil Services, IFoS and Geo-Scientist PYQ →

CoversWoodward–Fieser rules for enonesα,β-unsaturated ketone λmaxnon-conjugated ketone n→π*UV spectroscopy

All parts of Question 7

7(a)(i) Polyphosphazene formation and solubility10 marks
7(a)(ii) Preparation and branching of silicones10 marks
7(b)(i) Checking the conjugated chromophore5 marks
7(b)(ii) Conjugated and non-conjugated ketones5 marks
7(c) Five reagent-based transformations10 marks