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Question

Among the following complex which can act as oxidising agent?

A
[Mn(CO)6]
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B
[Mn(CO)6]+
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C
[Mn(CO)5]
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D
[V(CO)6]
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Solution

The correct option is D [V(CO)6]
in a redox reaction, the oxidising agent receives electrons and thus gets reduced.
For the oxidising agent to receive electrons its EAN( effective atomic number ) should be lesser than the nearest noble gas atomic number
Since EAN of Vanadium in the given complex is 35 which is one lesser than 36(that of nearest noble gas Krypton)
Thus it will serve as oxidising agent

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