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GATE 2021 CY – Question 54

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 select

The correct statement(s) about actinides is/are:

  1. The 5f electrons of actinides are bound less tightly than the 4f electrons.
  2. The trans uranium elements are prepared artificially.
  3. All the actinides are radioactive.
  4. Actinides do not exhibit actinide contraction.

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Correct answer: (A) The 5f electrons of actinides are bound less tightly than the 4f electrons.; (B) The trans uranium elements are prepared artificially.; (C) All the actinides are radioactive.

Explanation

The 5f orbitals are generally more spatially extended and less tightly bound than lanthanide 4f orbitals, supporting A. Transuranium elements are conventionally prepared artificially, B, and all actinides are radioactive, C. Poor shielding by 5f electrons produces actinide contraction, so D is false. **A,B,C**.