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Chemistry · Coordination Compounds

JEE Main 2026 — 5 April, Morning Shift — Question 59

The correct statements about metal carbonyls are A. The metal-carbon bonds in metals carbonyls possess both σ\sigma and π\pi-character. B. Due to synergic bonding interactions between metals and CO ligand the metal-carbon bond becomes weak. C. The metal-carbon σ\sigma 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\pi bond is formed by the donation of electrons from filled d-orbital of metal into vacant π∗\pi^{*} orbital of CO. Choose the correct answer from the options given below:

  1. Option A:

    A and B only

  2. Option B:

    A, C and D only

    Correct
  3. Option C:

    B and C only

  4. Option D:

    A and D only

Answer: B

Step-by-step solution

(A) The metal-carbon bonds in metal carbonyls possess both σ\sigma and π\pi-character. (B) The metal to ligand bonding creates a synergic effect which strengthens the bond between CO and the metal i.e. metal carbon bond becomes strong. (C) The metal-carbon σ\sigma 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\pi bond is formed by the donation of electrons from filled d-orbial of metal into vacant π∗\pi^{*} orbital of CO. Correct answer are A, C, D

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Exam
JEE Main 2026
Paper
5 April, Morning Shift
Subject
Chemistry
Chapter
Coordination Compounds
Topic
Theories of Bonding in Coordination Compounds

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