J & K CET Engineering J and K - CET Engineering Solved Paper-2009

  • question_answer
    The non-existant metal carbonyl among the following is

    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, \[\text{Mn(CO}{{\text{)}}_{\text{5}}}\]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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