Question

the metal carbonyl which does not follow ean rule

Answer 1

Effective Atomic Number is the number of electrons that surround the central metal complex in a metal complex.

The EAN (Effective Atomic Number) is valid for most carbonyls. However, certain carbonyls like V(CO)₆ do not follow the EAN rule.
The total electrons around the central metal atom (V) is 23+12 = 35, which is not equal to the number of electrons that surround any noble gas, hence it is a violation of the EAN rule.

Answer 2

Answer:

V(CO)₆ is a metal carbonyl which does not follow EAN rule.

Explanation:

What is EAN rule:

• The total number of electrons present surrounding the central metal ion is defined as the effective atomic number (EAN) in a complex.
• The EAN rule is also known as the "18-electron rule."
• The sum of electrons on the metal ion and the number of electrons signified by ligands can be determined using the formula.
• The EAN (Effective Atomic Number) is valid for most carbonyls. However, certain carbonyls like V(CO)₆ do not follow the EAN rule.

For V(CO)₆:

Contribution from V = 5 electrons

Contribution from 6 carbonyl ligands = 6 x 2 = 12

Total number of outermost electrons = 12 + 5 = 17

Hence, the molecule does not follow EAN rule.