VKC ScienceChemistry for written exams Telegram

Indian Forest Service (Mains)

Chemistry optional

  • 2 papers
  • 200 marks each
  • 3 h per paper

Paper II covers organic chemistry and spectroscopy.

Indian Forest Service (Mains), Chemistry optional · 2023 · Paper II

Q2(d). Butanone phenylhydrazone and Fischer cyclization

Question

Give the products of condensation of butan-2-one with phenylhydrazine, with mechanism.

Answer in brief

Condensation gives butan-2-one phenylhydrazone. Under the usual additional acidic Fischer conditions it can give 2,3-dimethylindole and 2-ethylindole.

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.

See what is included Already a member? Sign in

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.
Read the whole 2023 solution2023 question paper

Topic notes: aromatic substitution (electrophilic, nucleophilic) and heterocycles, with every Civil Services, IFoS and Geo-Scientist PYQ →

CoversFischer indole synthesisphenylhydrazone2,3-dimethylindoleenehydrazine[3,3] sigmatropic rearrangement

All parts of Question 2