First slide

Sidgwick's theory

Question

Which does not obey EAN rule

Easy

A

Fe(CO)₅
B

K₄[Fe(CN)₆]
C

[Cu(NH₃)₄]SO₄
D

[Co(NH₃)₆]Cl₃

Solution

Effective atomic number is EAN;
EAN = ‘Z’ of central metal - oxidation state of central metal +2(coordination number)
option (3) violates EAN rule.
EAN = 29 - 2 + 2 (4) = 35
EAN is not equal to atomic number of inert gas element.

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