UPSC Combined Geo-Scientist, Mains · 2026 · Mains Paper III
Q7(c). Birch reduction; Michael addition and decarboxylation
Question
(i) Identify the product and provide the name and mechanism for the following reaction: benzoic acid with Na, liq. NH₃, ROH. (ii) Predict the major products X and Y formed in the following reaction sequence: ethyl cinnamate + ethyl acetoacetate, NaOEt, EtOH → X; NaOH, H₂O, heat → Y. Suggest a suitable mechanism for the formation of X.
Model answer
The free solution for 2026 answers the questions picked in its time plan. Question 7 is answered in full in the Book Edition of the 2026 solutions of Geo-Scientist Chemistry Paper III.
CoversBirch reduction, Michael additionBirch reductionMichael addition and decarboxylation
All parts of Question 7
- 7(a) Thermal and photochemical electrocyclisations of cyclooctatriene10 marks
- 7(b) Bullvalene NMR; quasi-Favorskii rearrangement10 marks
- 7(c) Birch reduction; Michael addition and decarboxylation10 marks