Question:

The non-existant metal carbonyl among the following is

Updated On: Apr 29, 2024
  • $ Cr(CO)_{6} $
  • $ Mn(CO)_{5} $
  • $ Ni(CO)_{4} $
  • $ Fe(CO)_{5} $
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The Correct Option is B

Solution and Explanation

Usually, metal carbonyls follows EAN rule.
Among the given, $Mn( CO )_{5}$
does not follow EAN rule, so it does not exist.
EAN = atomic no. of metal + electrons of ligands
$36 \neq 25+(5 \times 2) \neq 35$
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Concepts Used:

Coordination Compounds

A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.

Coordination entity:

A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.

Ligands:

A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.