VKC ScienceChemistry for written exams Telegram

UPSC Combined Geo-Scientist

Chemist

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

Mains Paper I covers inorganic chemistry.

UPSC Combined Geo-Scientist, Mains · 2021 · Mains Paper I

Q5(b). Trans-effect control of platinum products

Question

Predict the product and explain its formation in the following reactions: (i) [Pt(PR₃)₄]²⁺ + 2Cl⁻ → (ii) [PtCl₄]²⁻ + 2PR₃ → (iii) cis-[Pt(NH₃)₂(py)₂]²⁺ + 2Cl⁻ →

Answer in brief

(i) cis-[PtCl₂(PR₃)₂]; (ii) trans-[PtCl₂(PR₃)₂]; (iii) trans-[PtCl₂(NH₃)(py)].

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 2021 solution2021 question paper

Topic notes: labile and inert complexes, substitution mechanisms, the trans effect, stability constants and the chelate effect, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coverstrans effectsquare planar substitutionplatinum(II) complexescis-trans isomerstrans influence

All parts of Question 5