VKC ScienceChemistry for written exams Telegram

UPSC Combined Geo-Scientist

Chemist

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

Mains Paper III covers analytical and organic chemistry.

UPSC Combined Geo-Scientist, Mains · 2019 · Mains Paper III

Q7(a). Grignard homologation

Question

Benzyl chloride is treated with Mg/ether, formaldehyde and then H₂O/H⁺. Identify intermediates and give mechanisms of the last two steps.

Answer in brief

The sequence gives benzylmagnesium chloride, its formaldehyde-addition alkoxide, then 2-phenylethanol.

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 2019 solution2019 question paper

CoversGrignard homologationOrganometallic synthesis

All parts of Question 7