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The correct statement(s) regarding the binary transition metal carbonyl compounds is (are) (Atomic numbers: Fe = 26, Ni = 28 )
  • a)
    Total number of valence shell electrons at metal centre in Fe(CO)5 or Ni(CO)4 is 16
  • b)
    These are predominantly low spin in nature
  • c)
    Metal–carbon bond strengthens when the oxidation state of the metal is lowered
  • d)
    The carbonyl C−O bond weakens when the oxidation state of the metal is increased
Correct answer is option 'B,C'. Can you explain this answer?
Verified Answer
The correct statement(s) regarding the binary transition metal carbony...
(A) The total number of valence electrons in Fe(CO)5 and (Ni(CO)4 is 18.
(B) Carbonyl group is a strong field ligand. Hence, the complexes are low spin in nature.
(C) For the lower oxidation state of metal, the electron density of the metal is high. Therefore, it leads to an increased back bonding. Therefore, the strength of M −C bond increases.
(D) Increased oxidation state of metal decreases back bonding and therefore it leads to an increased strength of C −O bond.
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The correct statement(s) regarding the binary transition metal carbony...
Valence Shell Electron Count and Spin Nature
- Total number of valence shell electrons at the metal center in Fe(CO)5 or Ni(CO)4 is 16.
- These compounds are predominantly low spin in nature, which means they prefer to have fewer unpaired electrons.

Metal-Carbon Bond Strength
- The metal-carbon bond strengthens when the oxidation state of the metal is lowered. This is because a lower oxidation state allows the metal to donate more electron density to the carbon, increasing the bond strength.

Carbonyl C-O Bond Strength
- The carbonyl C-O bond weakens when the oxidation state of the metal is increased. This is because a higher oxidation state reduces the electron density available for donation to the carbon monoxide ligands, weakening the bond between carbon and oxygen.
Therefore, the correct statements regarding binary transition metal carbonyl compounds are that they are predominantly low spin in nature and the metal-carbon bond strengthens when the oxidation state of the metal is lowered, while the carbonyl C-O bond weakens when the oxidation state of the metal is increased.
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The correct statement(s) regarding the binary transition metal carbonyl compounds is (are) (Atomic numbers: Fe = 26, Ni = 28 )a)Total number of valence shell electrons at metal centre in Fe(CO)5 or Ni(CO)4 is 16b)These are predominantly low spin in naturec)Metal–carbon bond strengthens when the oxidation state of the metal is loweredd)The carbonyl C−O bond weakens when the oxidation state of the metal is increasedCorrect answer is option 'B,C'. Can you explain this answer?
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The correct statement(s) regarding the binary transition metal carbonyl compounds is (are) (Atomic numbers: Fe = 26, Ni = 28 )a)Total number of valence shell electrons at metal centre in Fe(CO)5 or Ni(CO)4 is 16b)These are predominantly low spin in naturec)Metal–carbon bond strengthens when the oxidation state of the metal is loweredd)The carbonyl C−O bond weakens when the oxidation state of the metal is increasedCorrect answer is option 'B,C'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about The correct statement(s) regarding the binary transition metal carbonyl compounds is (are) (Atomic numbers: Fe = 26, Ni = 28 )a)Total number of valence shell electrons at metal centre in Fe(CO)5 or Ni(CO)4 is 16b)These are predominantly low spin in naturec)Metal–carbon bond strengthens when the oxidation state of the metal is loweredd)The carbonyl C−O bond weakens when the oxidation state of the metal is increasedCorrect answer is option 'B,C'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The correct statement(s) regarding the binary transition metal carbonyl compounds is (are) (Atomic numbers: Fe = 26, Ni = 28 )a)Total number of valence shell electrons at metal centre in Fe(CO)5 or Ni(CO)4 is 16b)These are predominantly low spin in naturec)Metal–carbon bond strengthens when the oxidation state of the metal is loweredd)The carbonyl C−O bond weakens when the oxidation state of the metal is increasedCorrect answer is option 'B,C'. Can you explain this answer?.
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