Indian Forest Service (Mains), Chemistry optional · 2021 · Paper II
Q2(d)(ii). Chalcone, cyanide addition and reduction
Question
Complete acetophenone + benzaldehyde → A; A —(KCN, EtOH, Δ)→ B; B —(excess LiAlH₄)→ C, with suitable initial conditions.
Answer in brief
A is chalcone, B is PhCOCH₂CH(Ph)CN, and C after aqueous work-up is PhCH(OH)CH₂CH(Ph)CH₂NH₂.
Part of VKC Basic
Read the key points and the full model answer with VKC Basic
VKC Basic (₹999 for 6 months) opens every solved answer, the notes, the handbook and the daily answer archive. Every Mains test series includes it.
The full model answer
As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.
The handwritten model answer pages open with the VKC plan.
CoversClaisen–Schmidt condensationchalconeconjugate addition of cyanideMichael additionLiAlH₄ reduction of nitrile
All parts of Question 2
- 2(a) Thermal closure of octatriene10 marks
- 2(b) Hydrolysis of tert-butyl chloride10 marks
- 2(c)(i) p-Toluidine to m-bromotoluene5 marks
- 2(c)(ii) Hofmann elimination5 marks
- 2(d)(i) Elimination of 2-bromobutane5 marks
- 2(d)(ii) Chalcone, cyanide addition and reduction5 marks