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Question

Which of the following molecule does not obey 18 electron rule?

A
[Mn(CO)6]
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B
Fe(CO)5
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C
[PtCl6]2
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D
[Ni(CO)4]
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Solution

The correct option is A [Mn(CO)6]
According to 18e rule, in a complex the sum of valence electrons and the electrons donated by the ligands equals to 18. It provides a closed and stable configuration, ns2 (n1)d10 np6

(i).[Mn(CO)6]7+(6×2)=19(ii).[Fe(CO)58+(5×2)=18(iii).[Pt(Cl)6]26+(6×2)=18(iv).[Ni(CO)4]10+(4×2)=18

Hence, compound (a) does not obeys 18e rule.

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