Indian Forest Service (Mains), Chemistry optional · 2024 · Paper II

Q7(a)(ii). Thermal organoborane isomerization

5 marks
Topic: Synthetic uses of reagents
Question only

Question

Identify R and S from 1-methylcyclopentene with BH₃/heat, then H₂O₂/NaOH.

Model answer

The free solution for 2024 answers questions 1, 2, 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: reagents for oxidation, reduction and hydroboration, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversorganoborane isomerizationhydroboration-oxidation1-methylcyclopentenethermal migration of boronanti-Markovnikov

All parts of Question 7

7(a)(i) Hydroboration followed by carbonylation5 marks
7(a)(ii) Thermal organoborane isomerization5 marks
7(b)(i) UV bands of a ketone and an enone10 marks
7(b)(ii) Woodward–Fieser estimates for two tetraenes5 marks
7(c) Identification of an amino ester15 marks