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Question

In the isoelectronic series of metal carbonyl, The CO bond strength is expected to increase in the order:


  1. (V(CO)6)- < (Cr(CO)6) < (Mn(CO)6)+

  2.   (Mn(CO)6)+ < (Cr(CO)6) < (V(CO)6)-

  3. (Cr(CO)6) < (Mn(CO)6)+ < (Cr(CO)6)-

  4. (V(CO)6)- < (Mn(CO)6)+ < (Cr(CO)6)


Solution

The correct option is A

(V(CO)6)- < (Cr(CO)6) < (Mn(CO)6)+


CO bond strength is reciprocal to the extent of back donation involved in synergic bonding (ie)MCO

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