A) \[Cr{{(CO)}_{6}}\]
B) \[Mn{{(CO)}_{5}}\]
C) \[Ni{{(CO)}_{4}}\]
D) \[Fe{{(CO)}_{5}}\]
Correct Answer: B
Solution :
Usually, metal carbonyls follows BAN rule. Among the given,\[Mn{{(CO)}_{5}}\]does not follow EAN rule, so it does not exist. EAN = atomic no. of metal + electrons of ligands \[36\ne 25+(5\times 2)\ne 35\]
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