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Metal Carbonyls

The non-exist...

Question

The non-existant metal carbonyl among tthe following is:

C r (C O)_{6}

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M n (C O)_{5}

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N i (C O)_{4}

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F e (C O)_{5}

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Solution

The correct option is B $M n (C O)_{5}$
Usually, metal carbonyls follow EAN rule. Among the given, $M n (C O)_{5}$ does not follow EAN rule; so it does not exist.
$E A N =$ atomic number of metal $+$ electrons of ligands
$E A N = 25 + (5 \times 2) = 35 \neq 36$ .

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