Q.

Which one of the following complexes does not obey EAN rule

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a

Fe(CO)5

b

K4[Fe(CN)6]

c

[Cu(NH3)4]SO4

d

[Co(NH3)6]Cl3

answer is C.

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Detailed 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) = 35EAN is not equal to atomic number of inert gas element.
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