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GATE 2024 CY – Question 39

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

In the following reactions, the structures of I, II, and III, respectively, are

Rhodium hydride insertion and carbonylation and ruthenium carbene reaction, with candidate structures I–III.
  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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Correct answer: (A) Option A in the figure

Explanation

Hydride insertion favors the linear rhodium alkyl; CO insertion then gives its acyl. The ruthenium carbene opens the cyclopropene to a conjugated diene alkylidene, as shown in A.

Official GATE 2024 answer key: https://gate2026.iitg.ac.in/doc/download/2024/CYFinalAnswerKey.pdf