UPSC Combined Geo-Scientist, Mains · 2019 · Mains Paper III
Q9(d). Thermal or photochemical? Woodward–Hoffmann prediction
Question
Use the Woodward–Hoffmann rules to predict whether the following reaction would occur thermally or photochemically. [reaction given in the paper]
Model answer
The free solution for 2019 answers questions 1, 3, 4, 6, 7 and 10, 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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CoversWoodward-Hoffmann ruleselectrocyclic reactionconrotatorydisrotatory
All parts of Question 9
- 9(a) Product A of an aldehyde condensation with mechanism10 marks
- 9(b) Birch reduction–alkylation sequence of a methoxybenzoic acid10 marks
- 9(c) E2 of menthyl and neomenthyl chlorides5 marks
- 9(d) Thermal or photochemical? Woodward–Hoffmann prediction5 marks