Indian Forest Service (Mains), Chemistry optional · 2025 · Paper II
Q5(c). Photoreduction of benzophenone
Question
Give products and electronic states for benzophenone irradiated in isopropanol.
Answer in brief
Benzopinacol is the characteristic coupling product; isopropanol is oxidised to acetone.
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Coversphotoreduction of benzophenonebenzopinacoltriplet nπ* stateintersystem crossingketyl radical
All parts of Question 5
- 5(a) Edman degradation5 marks
- 5(b) Complementary base pairs in RNA5 marks
- 5(c) Photoreduction of benzophenone5 marks
- 5(d) Proton NMR of dry ethanol5 marks
- 5(e) Mass fragmentation of acetic anhydride5 marks
- 5(f) Structure from combined spectra15 marks