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JEE Main 2026 · 5 Apr · Shift 1, Chemistry question 61

The correct statements about metal carbonyls are

A. The metal-carbon bonds in metal carbonyls possess both σ and π-character.

B. Due to synergic bonding interactions between metal and CO ligand, the metal-carbon bond becomes weak.

C. The metal-carbon σ 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 π bond is formed by the donation of electrons from filled d-orbital of metal into vacant π* orbital of CO.

Choose the correct answer from the options given below:

Choose one option
Answer and worked solution

Official answer: B

Each statement.

  • A: The M-C bond has σ and π character. True.
  • B: Synergic bonding strengthens the M-C bond; it is the C-O bond that weakens. False.
  • C: The σ bond is the carbon lone pair donated into a vacant metal orbital. True.
  • D: The π bond is back-donation from filled metal d orbitals into the CO π* orbital. True.

Correct: A, C and D.

(B)

Topics:Metal carbonyls and EAN rule
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