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JEE Main Chemistry Coordination Compounds 2026 JEE Main 2026 (05 April Shift 1)

JEE Main Chemistry Question (2026) — Solution

Question

The correct statements about metal carbonyls are A. The metal-carbon bonds in metal carbonyls possess both and -character. B. Due to synergic bonding interactions between metal and CO ligand, the metal-carbon bond becomes weak. C. The metal-carbon bond is formed by the donation of lone pair of electrons on the carbonyl carbon into a vacant orbital of metal. D. The metal-carbon bond is formed by the donation of electrons from filled d-orbital of metal into vacant ^* orbital of CO. Choose the correct answer from the options given below:

Options

  1. A. A and B Only
  2. B. A, C and D Only
  3. C. B and C Only
  4. D. A and D Only

Answer

B. A, C and D Only

Step-by-step solution

Statement A is correct. The metal-carbon bond in metal carbonyls possesses both and character due to synergic bonding. Statement B is incorrect. The synergic bonding interaction between the metal and the CO ligand strengthens the metal-carbon bond. Statement C is correct. The metal-carbon bond is formed by the donation of a lone pair of electrons from the carbonyl carbon into a vacant orbital of the metal. Statement D is correct. The metal-carbon bond is formed by the back-donation of electrons from a filled d-orbital of the metal into the vacant antibonding ^ * orbital of the CO ligand. Therefore, statements A, C, and D are correct. Answer: A, C and D Only

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