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GATE 2025 CY – Question 36

Inorganic Chemistry · Organometallics: 18-Electron rule; metal-alkyl, metal-carbonyl, metal-olefin and metal-carbene complexes and metallocenes. Fluxionality in organometallic complexes. Types of organometallic reactions. Homogeneous catalysis – Hydrogenation, hydroformylation, methanol to acetic acid process, olefin metathesis and Wacker oxidation. Heterogeneous catalysis – Fischer-Tropsch reaction, Ziegler-Natta polymerization. · 2 marks · Multiple choice

The reaction that proceeds through an oxidative addition followed by a reductive elimination is [Given: Atomic numbers Ni = 28, Ta = 73, Zr = 40, Pt = 78]

Four organometallic reactions with candidate oxidative-addition and reductive-elimination steps.
  1. Option A in the figure
  2. Option B in the figure
  3. Option C in the figure
  4. Option D in the figure

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Show answer and explanation

Correct answer: (D) Option D in the figure

Explanation

The platinum reaction involves intramolecular C–H oxidative addition and subsequent reductive elimination of the arene. The early-metal tantalum and zirconium reactions use sigma-bond metathesis rather than oxidative addition.

Official GATE 2025 answer key: https://gate2026.iitg.ac.in/doc/download/2025_Key/CY_Keys.pdf